Part 6 - I love the Internet
I recognize obsession when I see it.
I am bothered about relatively imprecise measures of distance from a shooting location to the summit. There must be a way to calculate the distance if I knew the latitude and longitude of both points – something the Photographer’s Ephemeris will tell me. The math is HARD. But I find a calculator on the Internet that gives me the distance and a bonus, the compass bearing.
And I want to get a better fix on our shooting window. Astronomical Twilight ends when the sun is 18 degrees below the horizon and begins the next morning when it is also 18 degrees below the (other) horizon. Between these times, sunlight diffused through the atmosphere is less bright than starlight. I find another neat little calculator on the Internet that tells me by month and day, at any location on earth, the beginning and end of Astronomical Twilight. On August 8th, we have a window between 10:40 and 3:51. So all is good.
Did I mention I love the Internet?
Mt RainierWashingtonMilky Way