The natural Navigation: The Right Course, Naturally

Thomas Manning (1772-1840) was an eccentric academic and the first British traveller to reach Tibet. After donning a heavy disguise and much perseverance and patience he finally met the Dalai Lama, who was only seven years old at the time.

An excerpt from his account of his travels is a good reminder of how much better connected the travellers of old were to the incestuous relationship between the sun, time and direction.

We hurried into the town where we were to change
horses, but our haste was fruitless. There we were obliged to wait
until our baggage came up long, long after us, and until it was
adjusted upon fresh cattle. If we now had galloped all the way to
Lhasa the sun would have been in the south before we could have
been in the august presence of the Tagin. This was exceeding
discomfort to my Munshi, but great

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In this photo you can see the dew that the sun has not yet burnt off. The shadow itself is mostly moving right to left in this picture, leaving the thin band of wet wood in the shade all the time. This thin band is a rough east-west line at all times of the year, but quite an accurate one at times like this, close to the spring and autumnal equinoxes.

The small patch of moisture that is in the sun reveals the direction that the shadow is shortening, a crude north-south line as we near the middle of the day.

Time and navigation have a cosy relationship, as John Harrison, inventor of the chronometer that cracked the longitude problem in the 18th Century would attest. The sun, earth, moon and planets and stars have at times been seen as cogs in a huge clock.

So many natural phenomena take their orders from these bodies and tide is one of the best known of these. I took this photo of the tide running past a cardinal off Jersey this weekend. The cardinal is an easterly one, signalling that the safer water lay to the east of it. But could it tell us anything else? With two pieces of information, time and tide table, we can discern others such as the speed of the water and its direction. If we had no other references: no sight of land, no chart, no compass, no GPS… that small patch of water could reveal…

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