![]() With respect to the Earth's orbital plane, the moon might not Because moon's orbital plane is inclined a little more than 5 degrees.Aristotle (384-322 BC) noticed that the shadow cast by theĮarth on the moon was circular, and thus concluded that the Earth was.We would not see the sun, but we would see a reddish glow around the edge The moon during a total lunar eclipse and looked at Earth, The moon can be darker as some of the light is further absorbed by If the the Earth's atmosphere is particularly cloudy or dusty (e.g. ![]() Of the sun means that we see the light rays which are not bent. This particular scattering is called "Rayleigh Scattering"Īnd is the SAME REASON THAT THE SKY IS BLUE IN THE DAY,īut the sun looks red at the horizon! The blue light is scattered more and so our more direct view Only the red light ray paths are scattering The conditions of the Earths atmosphere, blue light (high frequency)īe seen at the small angles of scattering needed to illuminate It turns out that the physics of light scattering tells that, for Whose ray paths are bent because the light scatters off of the gas To become totally eclipsed when favorably aligned to enter the umbra.Ī total eclipse, including the penumbral stage takes about 6 hours.ĭuring a total lunar eclipse, the moon takes on a dark red color because it isīeing lighted slightly by sunlight passing through the Earth's atmosphere The moon travels its diameter in 1 hour, so it takes about 1 hour We can see (fig 3-10) the stages as the eclipse ![]() Then the diameter of the dark umbral projection is 16,000 km,Ī TOTAL LUNAR ECLIPSE occurs when no part of the moon is If we place a screen at the distance of the moon, The umbra of the Earth's shadow is about 1.4 x 10^6 km long.In the penumbra, sunlight is only dimmed and not blocked. The UMBRA is the region of total shadow, while the PENUMBRA is the surrounding region of partial shadow. With the moon lying in the UMBRA of the Earth's shadow. Lunar eclipses (like solar eclipse) can be partial or total,ĭepending on whether the light of the sun is partially or completely blockedįrom reaching the moon.
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