Friday, February 19, 2016
Sunset Through a Telescope
Tyler and Tim were at the TWR transmitter site again last night. They are working on a super duper sunset time lapse. I got them situated and then drove over to the Sorobon road and shot a picture of the sun setting behind a tower as seen through a Mead ETX 90 telescope. According to Google Maps, i was 1.28 miles from the tower. (2.07 km)
That green rim at the top of the sun is not chromatic aberration from the lens, because a mirror telescope doesn't produce chromatic aberration. The green rim at the top and red rim at the bottom is the atmosphere acting like a prism and refracting the sunlight. This is basically where the green flash comes from. The green part of the Sun's image sets last.
Posted by Brad