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Pastimes : NNBM - SI Branch -- Ignore unavailable to you. Want to Upgrade?

To: Clappy who wrote (26824)	6/12/2003 2:45:41 PM
From: abuelita	Respond to of 104202

c- thanks ... i'll put them on pbase for him. -r

To: Clappy who wrote (26824)	6/12/2003 3:30:31 PM
From: lurqer	Read Replies (5) \| Respond to of 104202

ClapOff Hey Off, I'm currently scanning some earlier posts written while I was taking my market breather - still got about 500 to go. Couple of stimulated thoughts. First Steve’s Digi Cams. What a “Blast from the Past”. It’s been years, but for a while, the message board at Steve’s and the digital camera newsgroup was home. Second – all the lunar eclipse discussion. Let’s set the stage. The Sun is considerably bigger than the Earth, so a line drawn from the top of the Sun tangent to the top of the Earth and a line drawn from the bottom of the Sun and tangent to the bottom of the Earth, will intersect. This implies that as the Earth orbits the Sun, there is a conical shadow pointing away from the Sun that sweeps along with the Earth. Not only does the Moon revolve around the Earth, but the Moon’s orbit also revolves. Thus, the alignments are sometimes such that the Moon enters that conical shadow. So far interesting, but not particularly remarkable. Now, through in the Earth’s atmosphere. Like other transparent matter (glass, etc.), the atmosphere refracts light. That means that it bends the Sun’s light. But it doesn’t just bend it, refraction preferentially bends by color. That is the colors are spread out into a spectrum from red to blue – each wavelength being bent by a different amount. This spectrum of color is bent into that conical shadow. When the Moon passes through the Earth’s shadow, it passes through the part of the shadow that has red light refracted by the Earth’s atmosphere. Hence, instead of disappearing, it turns a coppery color. Now for the neat part. Since Earth is four times as large as the Moon, a Full Earth as seen from the Moon would be four times as large. That’s spectacular enough, but consider the Earth as viewed from the Moon, when the Moon is in a total lunar eclipse. The Earth itself is just a dark circle in the Lunar sky. Ahh, but the Earth’s atmosphere is bending that red light. So in the Lunar sky is a huge (four times the size of a Full Moon) ring of Red Fire. For that shot, I’d definitely break out the ole digicam. lurqer