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Астронет: Астрономическая картинка дня Как определить, что светится на небе http://variable-stars.ru/db/msg/1931069/eng |
Credit & Copyright: HK (The League of Lost Causes)
Explanation:
What is that light in the sky?
The answer to one of humanity's more common questions
may emerge from a few quick observations.
For example -- is it moving or blinking?
If so, and if you live near a
city,
the answer is typically an airplane,
since planes are so numerous and so few stars and
satellites are bright enough
to be seen over the glare of
artificial city lights.
If not, and if you live far from a city, that bright light is likely a planet such
as
Venus or
Mars --
the former of which is constrained to appear near the horizon just before dawn or
after dusk.
Sometimes the low apparent motion of a distant
airplane near the horizon makes it hard to tell from
a
bright planet,
but even this can usually be discerned by the plane's motion over a few minutes.
Still unsure?
The featured chart gives a sometimes-humorous but mostly-accurate assessment.
Dedicated sky enthusiasts will likely note -- and are
encouraged to provide -- polite corrections.
Chart translations:
Italian,
German,
Latvian,
Persian,
Polish,
Spanish,
and
Turkish
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.