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Астронет: Астрономическая картинка дня APOD: 2026 August 25 Б Earths Shadow Visualized with Lunar Eclipses http://www.astronet.ru/db/msg/2042258 |
Credit & Copyright: Tim Martin
Explanation:
WhatБs creating this giant hole in space?
This is not a
black hole Б itБs a shadow.
ItБs EarthБs shadow.
Since at least the time of
Aristotle,
people have noted that
Earth's dark shadow on the
Moon during a partial
lunar eclipse is circular -- although never a
whole circle.
Using modern digital technology, though,
the images of multiple
lunar eclipses can be combined to show Earth's complete shadow.
The featured image compilation by a perseistent astrophotographer
is constructed from 22 years of lunar eclipses.
The Moon is not
eclipsed every month
(moon-th) because the
Moon's orbit is
slightly tilted relative to Earth's orbit.
Close inspection of some lunar eclipse images shows a
faint
blue
band where
EarthБs atmosphere filters out more red sunlight than blue.
Later this week, a
new lunar eclipse will occur and will be
best visible in parts of North and South America, Europe, and Africa.
APOD's main NASA site is
moving :
From apod.nasa.gov to
science.nasa.gov/apod
Authors & editors:
Robert Nemiroff
(MTU) &
Jerry Bonnell
(USRA)
NASA Web Site Statements, Warnings,
and Disclaimers
NASA Official: Jay Norris.
Specific
rights apply.
A service of:
LHEA at
NASA /
GSFC
& Michigan Tech. U.
Based on Astronomy Picture
Of the Day