Lunar Motion & Eclipses. Lunar Phases Caused by Moon’s changing position around the Earth See dif.…
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TABLE OF CONTENTS:
SAFETY
ANATOMY OF A LUNAR ECLIPSE
PENUMBRAL ECLIPSES
PARTIAL ECLIPSES
TOTAL ECLIPSES
REVIEW ECLIPSE TYPES
DANJON SCALE
NEXT ECLIPSES
MORE
Credit: Johannes Schedler
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Credit: Johannes Schedler
Lunar eclipses are perfectly safe to view without protection.
You can use your eyes, binoculars or telescopes.
Be patient, it takes time for the lunar disc to change color.
SAFETY
A lunar eclipse happens when Earth comes between the Sun and the Moon, projecting its shadow onto our satellite. Shadows come
in 2 forms: the penumbra which is the outmost and is partly-shaded; and the umbra, which is the innermost and is fully-shaded.
ANATOMY OF AN ECLIPSE
Umbra
Penumbra
Frontal view of Earth’s shadow.
Penumbral eclipses can be total, when the whole Moon enters the penumbra; or partial, when a fraction of the Moon
enters the penumbra. They are difficult to detect because the Moon only changes its brightness a bit.
Umbra
Penumbra
PENUMBRAL ECLIPSE
Partial umbral eclipses take place when a fraction of the Moon enters the umbra, and of course, in its way it also
enters the penumbra. When in the umbra, the lunar disc will change color or become very dark.
Umbra
Penumbra
PARTIAL ECLIPSE
Total umbral eclipses take place when all of the Moon enters the umbra, and of course, in its way also the penumbra. When in the umbra, the lunar disc will change color or
become very dark.
Umbra
Penumbra
TOTAL ECLIPSE
Credit: Tim Trott
1 2 3 4 5
During the maximum of a total umbral eclipse we can see what color the lunar disc has taken and assign a value
according to the Danjon Scale.
DANJON SCALE
0 very dark totality, with the Moon almost invisible
1 dark/gray/brownish, details distinguishable with difficulty
2 deep red/rust, very dark central shadow, bright outer edge
3 brick-red with a bright or yellow rim
4 bright copper-red/orange, with a bluish & very bright rim
DANJON SCALE
NEXT ECLIPSES
Visible in the continental USA
Date Type
March 23, 2016 penumbral
February 11, 2017 penumbral
January 31, 2018 total
MORE
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