ACTIVITY: Using the Danjon 5 point scale to measure luminotsiy and hue, observe the Lunar Eclipse at all phases and classify the shadow and hue of the eclipse as observed during the total eclipse.
SUMMARY:The brightness of the moon varies widely from one eclipse to another. Many factors can affect the appearance of the Moon during a lunar eclipse including the Moon's path through the Earth's umbra, and the current conditions of the Earth's atmosphere. Thus, visual estimates of the colors seen on the totally eclipsed moon and their changes in different phases is valuable. In the early 20th century, French astronomer André Danjon introduced the five-point scale of lunar luminosity ("L") for classifying the visual appearance and brightness of the Moon during total lunar eclipses. Compare your visual observation to this chart, and record it for each phase. Report it with your name/location.L= 0 Very dark eclipse. Moon almost invisible, especially at greatest eclipse.L = 1 Dark Eclipse, gray or brownish in coloration. Details distinguishable only with difficulty.L= 2 Deep red or rust-colored eclipse. Very dark central shadow, while outer edge of umbra is relatively bright.L = 3 Brick-red eclipse. Umbral shadow usually has a bright or yellow rim.L = 4 Very bright copper-red or orange eclipse. Umbra shadow has a bluish, very bright rim.