The natural Navigation: The Right Course, Naturally

My thanks to Mark Evans who not only flew over from Oman for a course, but also sent me this great time lapse photo from Oman.

Mark is the General Manager of Outward Bound Oman, which does not sound like the worst job in the world to me! Outward Bound Oman, under Mark’s leadership, is teaching young Omanis many outdoor skills, including traditional methods of desert navigation.

Time for a bit of fun. Which way are we looking in this picture and why?

Answers by email please. I’ll post the correct answer in a couple of days.

Update.12/05/11.

We are looking just south of west. approx 255 degrees. Orion’s belt can be seen setting about one third the way in from the right. The arcing to the right is anticlockwise around the North Celestial Pole, to the left the stars are arcing clockwise around the South Celestial…

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Once more my pre-dawn ‘Batsense’ kicked in and I awoke before five with an urgent desire to go outside. It was not the pressure on my bladder, I do not think, but the idyllic conditions and night sky players that were beckoning me.

Orion and his sword were first to offer their greetings and then I noticed Jupiter still visible in the southwest. Sirius, Betelgeuse, Capella, the Plough and Polaris sketched out some order in the celestial sphere.

The moon was close to setting and was lighting up rows of fluffy cumulus clouds on their western edges. As time passed the clouds lost their bright white western edges, but gained pink and orange eastern ones. They moved sedately towards the northeast, signalling the start to a fine day. (Photo to the right was taken a few minutes ago.)

My thanks to Kevan Hubberd for sending in the idea about using Orion’s Sword as a way of finding south.

Orion’s Sword can be seen in the image to the left as the short vertical line of ‘stars’ under Orion’s Belt.

The Sword does indeed point to a spot on the horizon that is close to due south when the Sword is near vertical (as in this image), but it is a less dependable guide when it is well off-vertical, ie. when it is lower in the sky.

Technical bit for natural navigation zealots only: The reason that the Sword is more accurate when vertical is that it makes a line in the sky that is parallel to the line towards the south celestial pole. When vertical this line intersects with the horizon at a point very close to due south, but at times when the sword is closer…

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My thanks to Stuart Goring for sending over these great Thomas Hardy celestial quotes. Those who know this blog or my book will be aware that I love it when nature and the arts come together. The two following excerpts are taken from ‘Far From the Madding Crowd.’

“He stood and carefully examined the sky, to ascertain the time of night from the altitudes of the stars. The Dog-star and Alderbaran, pointing to the restless Pleiades, were halfway up the Southern sky ,and between them hung Orion, which gorgeous constellation never burnt more vividly than now, as it soared forth above the rim of the landscape. Castor and Pollux with their quiet shine were almost on the meridian: the barren gloomy square of Pegasus was creeping round to the north-west; far away through the plantation Vega sparkled like a lamp suspended amid the leafless trees, and Cassiopeia’s chair…

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The incestuous relationship between the stars and mythology is nothing new, but we often overlook how constantly the relationship is rekindled or how fresh some of the stories are. The following paragraph is from Emily Winterburn’s entertaining new book, ‘The Stargazer’s Guide‘.

‘In Orion these [stars] are Rigel, Betelgeuse and Bellatrix; in Canis Major there is Sirius – and even Canis Minor, which essentially consists of only two stars, has the very bright Procyon. These are familiar names, but not perhaps for astronomical reasons. Bellatrix and Sirius are probably better known now as characters in J.K. Rowling’s Harry Potter books, while Betelgeuse was the title of a Tim Burton film, albeit with a different spelling [Beetlejuice].