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Solar eclipse, Supermoon, Spring equinox: Friday will see three rare celestial events
March 2015 – SPACE - As
the eclipse plunges the UK and other places into darkness this Friday,
two other rare if less spectacular celestial events will be taking
place, too: a Supermoon and the Spring equinox. A Supermoon, or perigee
moon, happens when the full or new moon does its closest fly-by of the
Earth, making it look bigger than it normally does. And the spring
equinox refers to the time of the year when the day and night are of
equal duration, mid-way between the longest and shortest days. The
solar eclipse refers to a phenomenon where the sun and moon line up, so
that the latter obscures the former. And while it won’t be affected by
the two other events, it is rare that the three events happen even
individually.
Most
of the time, there are between three and six Supermoons a year. There
is set to be six in 2015, two of which have already happened. The next
will take place on March 20, the day of the eclipse, and the others will
come in August, September and October. Eclipses can only happen at new
moon, when the moon appears is entirely in shadow. And the spectacular
Supermoon images that are often spotted can only happen when the moon is
full, since it can only be seen then. As a result, only the last three
Supermoons of this year will be visible — because the moon is new rather
than full on March 20, it won’t be seen. But it will be gliding past us
closer than ever, and its shadow will be visible as it blocks out the
sun on Friday morning.
The
equinox will also happen on March 20. While it won’t have any
discernable, direct impact on how the solar eclipse looks, it will
contribute to a rare collision of three unusual celestial events. On
March 20, the Earth’s axis will be perpindecular to the sun’s rays —
which only happens twice a year, at the two equinoxes. After that, it
will start tipping over, making the days longer in the northern
hemisphere. As such, the equinox has long been celebrated as a time of
beginning and renewal, by a number of historic cultures, and is linked
to Easter and Passover. The equinox will happen at the same time as a
solar eclipse in 2053 and 2072, though it doesn’t always appear as close
together as that. –Independent UK
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