Bit of a tenuous link to the theme this week. It’s that big yellow thing that occasionally appears in the sky, although at the moment we seem to be experiencing nothing but rain in our little part of North Wales. So what about this motion thing?
The Sun’s motion about the centre of mass of the Solar System is complicated by perturbations from the planets. The barycentre is just outside the volume of the Sun when Jupiter and Saturn (the two planets with the greatest masses) are roughly in the same direction, as seen from the Sun. When they are in opposite directions, and the other planets are aligned appropriately, the barycentre can be very close to the centre of the Sun. Every few hundred years this motion switches between prograde and retrograde. Source: Wikipedia
Well if you understand that I take my hat off to you. Lets talk about practicalities. Most early Christian churches have an east/west orientation with the congregation looking to the east. This stems from the early catholic scriptures which say the second coming of Christ would happen in the east.
Now here’s where movement comes into it. The sun always rises in the east and sets in the west. For us in the Northern Hemisphere the sun will travel across the southern sky, meaning that if you are photographing in a church, looking towards the altar, strong light will stream through windows in the front, to your right and behind you if you stay late enough in the church. Which means you have to time when you want that photograph, otherwise you can end up with light flares or worse still totally blown out highlights. Of course the upside is you can use the light to get great shadows and highlights in your photograph.
You only get one sunrise and one sunset a day, and you only get so many days on the planet. A good photographer does the math and doesn’t waste either. – Galen Rowell
Too tenuous a link? Seen as we’re talking of big yellow things in the sky. How often do we see those big yellow helicopters in the skies over North Wales? They’re in the mountains, on the coast, extremely noisy close to, but we wouldn’t be without them. They’re the Rescue helicopters from 202 Squadron RAF Valley.
Being a military unit their primary role is the recovery of military aviators who have had to leave their aircraft. But more often than not they are involved in civilian rescues and since 1973 these take up 95% of the missions “the big yellow things” have flown. This photograph was taken just off the cliffs at Amlwch, Anglesey. It was reported that someone had fallen of the cliffs just above the port and in conjunction with the RNLI the rescue mission was underway. here you can see the winch man transferring to the lifeboat.
I’d love to hear from you. Was the link to the sun too tenuous? Let me know?
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