{"id":259,"date":"2018-10-30T19:04:47","date_gmt":"2018-10-30T17:04:47","guid":{"rendered":"http:\/\/www.hakos-astrofarm.com\/en\/?page_id=259"},"modified":"2020-04-03T13:08:48","modified_gmt":"2020-04-03T11:08:48","slug":"planetenweg","status":"publish","type":"page","link":"https:\/\/www.hakos-astrofarm.com\/en\/planetenweg\/","title":{"rendered":"Hakos Planet Walk"},"content":{"rendered":"\t\t
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A journey through our solar system to the Great Escarpment of Namibia <\/strong><\/p>

Can you imagine a distance of over 4 billion kilometers?\u00a0 This is the distance from the earth to Neptune, the outermost planet in our solar system.\u00a0 The planet walk allows the visitor to physically experience these dimensions because it corresponds to a scale, which represents the objects of our solar system and their relative distances.\u00a0 Starting from the sun with a diameter of 1.24 m in the model, you can walk from the Hakos farm house ‘through’ our solar system and after 2 km reach the furthest planet, Neptune, at the viewpoint Walter’s Point.\u00a0 Here, a spectacular mountain landscape awaits you with a view across the escarpment deep into the Namib Desert.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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The history and origin of our planet walk began in 2011 (see report below).\u00a0 Our key criteria in the implementation thereof was that it should be\u00a0 ‘environmentally friendly … secure from wildlife\u00a0 … informative … and weatherproof’.\u00a0 However, after only a few years, the harsh climate had taken its toll on the first version of the planetary trail, which resulted in the Planet Walk, version 2.0.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Walter creates the new planet Saturn<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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Elisabeth secures the planet with concrete in 'its orbit'<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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Uschi places Neptune in its path<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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A planet walk for Hakos<\/strong><\/p>

Rainer Glawion, University of Freiburg\/Germany<\/em><\/p>

An article in the local newspaper ‘Allgemeine Zeitung’ in Windhoek on 10 October 2005 made us sit up and take notice:\u00a0 there is only one single Planet Walk in Africa, and this was erected in Swakopmund in 2005.\u00a0 This Planet Walk, however, consists only of concrete pedestals upon which the planet outlines and names are engraved.\u00a0 On Hakos we wanted to implement a completely different concept, which had already proven itself on the Planet Trail in Freiburg\/Germany.\u00a0 In September 2011 this concept took shape.<\/p>

Every beginning is hard<\/strong><\/p>

But Namibia is not Freiburg.\u00a0 In the native Black Forest it is rather unheard of that zebras would run over educational boards and posts or baboons playing billiard with planet spheres.\u00a0 Therefore, careful planning was necessary.\u00a0 How could the facilities be made safe against wildlife?\u00a0 Which materials would resist the intense sunlight in Namibia?\u00a0 Which farm tracks are suitable?<\/p>

Practical planning began at Pupkewitz in Windhoek, where we met with Friedhelm.\u00a0 Whatever we had forgotten to purchase in this hardware store had to be improvised on Hakos as it was impossible to drive 270 km for a missing screw.\u00a0 We were shocked by the costs of wood.\u00a0 Euro 300 for eight wooden poles was almost unthinkable.\u00a0 Fortunately, there are only eight planets left as Pluto had been downgraded to a dwarf planet.\u00a0 In addition there were paints, wood sealer, brushes, screws, metal sheets, cement … so the shopping cart was quite full.<\/p>

Concept<\/strong><\/p>

Due to the great likelihood of damage by wildlife, the idea of erecting explanatory panels was out of the question.\u00a0 Instead, robust posts with mounted planetary spheres and planet names painted on these was expected to withstand the\u00a0 harsh environmental conditions.\u00a0 Guests could then take the Planet Information Brochure\u00a0 to guide them along the Planet Walk.\u00a0 The emphasis for this new concept was not only to convey the data of the planets (diameter, solar distance etc), but that additional explanations and information would awaken the curiosity and allow the visitor to imagine the vast dimensions of the solar system.\u00a0 The companion booklet (currently in German only), which is available on Hakos, depicts the Sun and each of the eight planets with detailed information (Figures 1 and 2). This booklet can be downloaded as a PDF-document here<\/a>.<\/p>

The Planet Walk would primarily appeal to interested guests without astronomical expertise, who will gain a good introduction to astronomy.\u00a0 Coupled with a stargazing tour in the evening, this makes for an amazing journey into our solar system and the universe.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Fig. 1 - Title page of the Hakos Planet Walk brochure (German)<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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Fig. 2 - Explanatory page of Jupiter in the Hakos Planet Walk brochure (German)<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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<\/p>

\u200bTab. 1 – Data for the Planet Walk on Hakos (length 2.0 km)\u200b<\/span><\/i>
<\/span><\/p>

\u00a0<\/span><\/p><\/td>

Distance to the sun<\/span><\/b><\/p><\/td>

Diameter<\/span><\/b><\/p><\/td><\/tr>

\u00a0<\/span><\/p><\/td>

Million km<\/span><\/p><\/td>

Scale<\/span><\/p>

1 : 2,25 Billion
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km<\/span><\/p><\/td>

scale<\/span><\/p>

1 : 1,125 Billion
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Sun<\/span><\/p><\/td>

–<\/span><\/p><\/td>

–<\/span><\/p><\/td>

1.392.000<\/span><\/p><\/td>

1,24\u00a0 <\/span>m<\/span><\/p><\/td><\/tr>

Mercury<\/span><\/p><\/td>

58<\/span><\/p><\/td>

25\u00a0 <\/span>m<\/span><\/p><\/td>

4.880<\/span><\/p><\/td>

4,3 mm<\/span><\/p><\/td><\/tr>

Venus<\/span><\/p><\/td>

108<\/span><\/p><\/td>

48\u00a0 <\/span>m<\/span><\/p><\/td>

12.100<\/span><\/p><\/td>

10,8 mm<\/span><\/p><\/td><\/tr>

Earth<\/span><\/p><\/td>

150<\/span><\/p><\/td>

67\u00a0 <\/span>m<\/span><\/p><\/td>

12.750<\/span><\/p><\/td>

11,3 mm<\/span><\/p><\/td><\/tr>

Mars<\/span><\/p><\/td>

228<\/span><\/p><\/td>

100\u00a0 <\/span>m<\/span><\/p><\/td>

6.800<\/span><\/p><\/td>

6,0 mm<\/span><\/p><\/td><\/tr>

Jupiter<\/span><\/p><\/td>

778<\/span><\/p><\/td>

346\u00a0 <\/span>m<\/span><\/p><\/td>

142.800<\/span><\/p><\/td>

12,7\u00a0 <\/span>cm<\/span><\/p><\/td><\/tr>

Saturn<\/span><\/p><\/td>

1434<\/span><\/p><\/td>

637\u00a0 <\/span>m<\/span><\/p><\/td>

120.500<\/span><\/p><\/td>

10,7\u00a0 <\/span>cm<\/span><\/p><\/td><\/tr>

Uranus<\/span><\/p><\/td>

2872<\/span><\/p><\/td>

1,276 km<\/span><\/p><\/td>

51.000<\/span><\/p><\/td>

4,5\u00a0 <\/span>cm<\/span><\/p><\/td><\/tr>

Neptune<\/span><\/p><\/td>

4495<\/span><\/p><\/td>

2,000 km<\/span><\/p><\/td>

49.400<\/span><\/p><\/td>

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Construction<\/span><\/strong><\/p>

In September 2011, I undertook an excursion to Namibia with 20 geography students from Freiburg.\u00a0 Subsequently, the student Thomas Ro\u00dfwog returned with me to Hakos to build the planetary path.\u00a0 Thomas studied physics and geography, had already qualified in precision engineering and was writing his thesis on parabolic solar power plants at the Fraunhofer Institute for Solar Physics.<\/p>

First, a suitable farm track had to be found on Hakos.\u00a0 It quickly became apparent that the route to the vantage point ‘Walter’s Point’ was the most suitable:\u00a0 the path has a manageable length of 2 km, passes the IAS observatory and is often visited by guests for game viewings.\u00a0 Also, the endpoint is in eye contact with the farm house, the starting point of the Planet Walk – which is important for the appreciation of distance.\u00a0 Looking back from Neptune to the farm house, where the sun is, leaves one in awe about the vastness of our solar system.<\/p>

The path length of 2 km results in a scale of 1: 2.25 billion for the planetary system.\u00a0 With that the planets shrink to a few millimeters and centimeters – so we decided to double the scale of the planets.\u00a0 With that, Mercury has a diameter of 4.3 mm, Jupiter 12.7 cm and the sun 1.24 meters (Table 1).\u00a0 Building a 1.2 m solar globe was not practical.\u00a0 Instead, a 1.24 m diameter solar disc, mounted on the wall at the entrance to the Guest Farm, points all incoming visitors towards the Planet Walk (Fig. 3).<\/p>

Ingenuity was needed when it came to the production of the planet spheres. The inner planets Mercury, Venus, Earth and Mars were turned from screw heads by Thomas Ro\u00dfwog, which also ensured a stable anchoring in the wooden posts (Fig. 4).<\/p>

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Fig. 3 - The 1.24 m sun disc next to the entrance to the Guest Farm as the starting point for the Hakos Planet Walk<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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Fig. 4 - The inner planets are turned by Thomas Ro\u00dfwog from screw heads<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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The outer planets Uranus and Neptune were made of iron balls, which Walter had found in the attic.\u00a0 Jupiter and Saturn were the biggest problem because neither the hardware store nor the inexhaustible storage rooms of Hakos offered such large iron balls.\u00a0 So Thomas sculptured these out of concrete.\u00a0 Saturn’s ring consists of a metal sheet cast in concrete (figs 5 and 6).\u00a0 Just as well, Saturn’s 60 moons were not to be reproduced …<\/span><\/p>

All planets were screwed onto 1.5 m high wooden posts, which were anchored in the ground with concrete (Figures 7 and 8).<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Fig. 5 - Under the expert guidance of Walter Straube, Thomas cuts out the Saturn ring from a metal plate<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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Fig. 6 - Then Saturn is sculptured from cement<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Fig. 7 - Moses and Willem stabilise Mars in concrete<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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Fig. 8 - Saturn is screwed onto the wooden post<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Planet Walk, Version 2.0<\/span><\/strong><\/p>

After only a few years, the forces of wind, weather and animals indicated clear signs of decay.\u00a0 Some wooden posts had been overturned by zebras, baboons had twisted the planet mountings, the intense sunshine had bleached the colors, and the sharp temperature variations between cold nights and hot days had chipped off the outer shells of the cement-sculptured gas planets of Jupiter and Saturn.\u00a0 In other words, the Planet Walk had to be renovated with building materials that were less susceptible to weather and wildlife.\u00a0 The wooden posts were replaced by iron posts and the modeled gas planets by iron balls (Figure 9).\u00a0 This time we did without a coloured coating of the planets. But where does one find massive iron balls with true-to-scale diameters?\u00a0 They were not to found in Windhoek.\u00a0 After an extended search, Uschi Pond eventually found some suitable iron balls in Cape Town.<\/span><\/p>

\"\"

Steaming and smoking … the new Saturn is born in a vice!<\/p><\/div>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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The new iron posts with planets were welded by Siggi Straube.\u00a0 On the 9th of May 2016 the time had come:\u00a0 In the evening sun Uschi Pond and Elisabeth Straube set off along the Planet Walk with a pick-up, loaded with the 8 planet steel posts, cement, pick axe and shovels. The remains of the old wooden planet posts were dug out and the new steel posts anchored with concrete in the ground (Figure 10).\u00a0 As a final touch, they laid large white quartzite rocks around the planet posts to prevent zebras from rubbing against these.<\/p>

Thus the Planet Walk shines again in its full glory.\u00a0 The hammered paint finish of the gas planets is attractive and weather resistant.\u00a0 The aluminum plates with engraved planet names on the iron posts are also very appealing.<\/p>

Due to the welding work, the Saturn ring ended up with a slight curvature.\u00a0 It now makes a popular photo subject:\u00a0 a ‘selfie’ with hat (Figure 11).<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Fig. 9 - The renovated planets are waiting in the Hakos garage for transport to their destinations<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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Fig. 10 - Elisabeth and Uschi place the new Saturn post into the ground - to the left in the picture is the old planet post with the excavated concrete base<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Fig. 11 - The initiator of the first Hakos planetary path, Rainer Glawion, pauses at Saturn and is very pleased with the renovated Planet Walk<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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Acknowledgment<\/span><\/strong><\/p>

The design and implementation of the first planetary path took place in September 2011 by the physics student Thomas Ro\u00dfwog from the University of Freiburg.\u00a0 Determined, dedicated, employing great craftsmanship and many practical ideas, Thomas ensured that the planetary path on Hakos became a reality in only 10 days.\u00a0 The Hakos team Walter, Waltraud and Friedhelm supported the project with valuable advice, active help and covered the costs.\u00a0 Christian Dombrowski, a freelance journalist and member of the Sternfreunde Breisgau in Freiburg, kindly granted permission to utilise his texts from the ‘Freiburger Planetenweg’ (www.freiburger-planetenweg.de<\/a>), adding to the content and didactic part of the Hakos Planet Walk.\u00a0 Siggi, Uschi and Elisabeth renewed the Planet Walk in May 2016.<\/p>

I express my gratitude to all the above persons and hope that the Planet Walk will bring joy to many guests on Hakos for many years to come, and continue to carry our shared hobby of astronomy forward.<\/p>

\u00a0<\/span>Rainer Glawion<\/span><\/i><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

A journey through our solar system to the Great Escarpment of Namibia Can you imagine a distance of over 4 billion kilometers?\u00a0 This is the distance from the earth to Neptune, the outermost planet...<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"jetpack_post_was_ever_published":false},"aioseo_notices":[],"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/Pblbvd-4b","_links":{"self":[{"href":"https:\/\/www.hakos-astrofarm.com\/en\/wp-json\/wp\/v2\/pages\/259"}],"collection":[{"href":"https:\/\/www.hakos-astrofarm.com\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.hakos-astrofarm.com\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.hakos-astrofarm.com\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.hakos-astrofarm.com\/en\/wp-json\/wp\/v2\/comments?post=259"}],"version-history":[{"count":52,"href":"https:\/\/www.hakos-astrofarm.com\/en\/wp-json\/wp\/v2\/pages\/259\/revisions"}],"predecessor-version":[{"id":3165,"href":"https:\/\/www.hakos-astrofarm.com\/en\/wp-json\/wp\/v2\/pages\/259\/revisions\/3165"}],"wp:attachment":[{"href":"https:\/\/www.hakos-astrofarm.com\/en\/wp-json\/wp\/v2\/media?parent=259"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}