Posted by Ed Kiser on May 04, 2009 at 14:32:44 user Kisered.
In Reply to: Re: Daylight saving time posted by Peter Ceresole on May 04, 2009 at 06:22:21:
To see to amazing features of how the sun rises and sets in various lattitudes, as well as other interesting features of our night sky, including the position of planets as well as the constellations from any point on the earth, at any time, on any date, try the BLUE SKY STAR MAPPER software program, available at:
http://www.allthingsransome.net/downloads/downloads.html
Near the equator, the sun is moving in practically a vertical path, so it quickly dips down into the horizon, thus bringing darkness on rather quickly, whereas in the higher lattitudes, such as the Lake District, the sun comes down a much more of an angle, so it seems to "glide down to a landing." With the low angle of approach to the horizon, the sun seems to slide along the horizon even as it drops lower and lower. It is during this partial hiding behind the horizon that gives us the twilight as we get light only from that portion of the sun above the horizon. Twilight thus seems to last longer before the sun manages to get completely below the horizon.
Dick would have loved to see that BLUESKY program. It does not include quotes from Tennison...
Ed Kiser, Kentucky