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Sailing again our way to Cape Town

26th March 2019 SOUTH ATLANTIC OCEAN.


Still under the influence of the anti-clockwise light wind spinning around a centre of relative High Pressure System, we got a windless
start of the day. The few Staysails that were set last evening were
taken away and quickly furled with just an easy gasket around, ready to
be set when we cross paths again with more favourable winds. But still
for a while the very light Easterlies almost blow on our nose. But soon
during the morning the predicted wind shift came, first coming from the
North and rising to 17-18kn. Engines keep helping our progress while we
set Lower and Middle Staysails together with the head-rig. And during
lunch, under winds becoming more and more fair it was clear that was not
going to take much longer to unfurl and set the rest of canvas. And so
it was, after the change of watch at 14:00h a few of us don harnesses
and climb aloft to get Top Gallants ready while Top Sails are being set.
By then a good 18kn breeze from the N by W was pulling us already at
6.5kn and the engines were turned off. From then on it just got better
and better for setting more sail and enjoy once more the awe-inspiring
South Atlantic sailing under favourable seas and weather.
Royals and Gaff Top Sail soon join the rest of sails set, while the
partially cloudy day started clearing up announcing the splendid sunset
we had. The warm light of the setting sun first dye the rig then the
scattered clouds in the sky. At the last moment, when the sun’s upper
rim touches the ocean horizon just before disappearing until tomorrow at
dawn, a short but clearly visible green shine could be seen. Again, we
could all witness for the second occasion in this trip the relatively
rare optical effect of the “Green Flash”. To observe it, a clear horizon
and clean air are needed, together with the luck that the shorter
wavelengths of the visible light (violet, blue and green) refract in the
appropriate way through their horizontal passage along the lower
atmosphere. A great end for yet another nice day at sea. We are back to
sailing, pulling ropes and climbing the rig, all in conjunction with
receiving more information about photography and navigation, as our crew
and guides are offering lately. Richard talked about black and white
photography. He’s been taking black and white photographs of crew during
their coffee breaks throughout the whole voyage. He shared some of his
pictures and techniques he used to achieve a similar result. He touched
upon lots of subjects, starting with brief introduction to old ways of
developing black and white photographs and how those techniques relate
to today’s modern digital tools we use as photographers. On the other
hand our Mate Finn kept going with a second lecture on Celestial
Navigation, today explaining how to calculate the Latitude at Apparent
Noon using traditional methods. When the sun crosses the meridian it
will reach its highest point and will be equally far away from sunrise
and sunset. This moment is also called Meridian Passage or culmination
and it represents the most relatively easy time of the day for
positioning. At the moment of the MP, the true bearing of the sun will
be 000° or 180°, depending on if you are North or South of the sun. At
this moment the latitude can be computed by using two simple formulas,
calculating the so called Zenith Distance (the corrected sextant measure
altitude of the sun that is subtracted from 90°), together with knowing
the declination of the sun at the meridian passage (tabulated on the
Nautical Almanac).
More complicated than many though before, Celestial Navigation is a full
schooling and practicing subject, to which nowadays not many are used
to. Loosing all the romantic remembrance of the old times, difficult
sailing, dead reckoning, often even guessing the positions and the
necessity of endless calculations to put the ship in the more… or maybe
less accurate charts and maps, the present times had gifted sailors with
GPS, Radars accurate watches and even different types of compasses
amongst other technological navigation instruments.

Geschreven door:
Jordi Plana Morales | guide

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