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Астронет: Астрономическая картинка дня Меркурий на горизонте http://www.variable-stars.ru/db/msg/1366058/eng |
Credit & Copyright: Juan Carlos Casado
Explanation:
Have you ever seen the planet Mercury?
Because
Mercury
orbits so close to the Sun, it never wanders far from the Sun in
Earth's sky.
If trailing the Sun,
Mercury will be visible
low on the horizon for only a short while
after sunset.
If leading the Sun,
Mercury will be visible only shortly before sunrise.
So at certain times of the year,
informed
skygazers with a little determination can usually pick
Mercury out from a site with an unobscured horizon.
Above, a lot of determination has been combined
with a little
digital manipulation to
show Mercury's successive positions during March of 2000.
Each picture was taken from the same location in Spain
when the Sun itself was 10 degrees below the
horizon and superposed on the single most
photogenic sunset.
Currently,
Mercury
is rising higher above the horizon with each passing sunset, and
just
now is angularly
very close to the brighter planet Venus.
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.