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Tuesday, April 30, 2013

The Sky This Week, 2013 April 30 - May 7

The Moon wanes in the morning sky this week, greeting early risers as
she passes through the star-poor reaches of the rising autumnal
constellations. Last Quarter occurson May 2nd at 7:14 pm Eastern
Daylight Time. Luna encounters no bright objects along her path this
week as she whittles away to a slender crescent in the morning
twilight by the week's end.
For most of us May 1st is simply the start of another month, albeit
one of the best months of northern springtime. Once quite widely
observed in the U.S., "May Day" fellout of favor with the rise of
socialism in the early 20th Century as the day became more universally
observed as International Workers' Day. These traditions are merely
riding on the shoulders of a very ancient fertility celebration that
happens to have an astronomical origin. May 1st happens to fall midway
between the vernal equinox and the summer solstice, and so was widely
observed as the traditional beginning of summer. To the ancient Celts
it was known as Beltane, and much of Europe under Roman rule observed
it as the festival of Flora, goddess of flowers. As Christianity
spread through Europe the Germanic tribes adapted the celebration
to"Walpurgisnacht" in honor of Saint Walpurga, who was canonized on
May 1, 870. May Day is still widely observed in Europe and South
America, and in many cases it's an official holiday. Characterized by
dancing around a May pole, the crowning of May Queens, and general
revelry, its ties to those ancient fertility rites may still be
glimpsed today. May Day is a so-called "cross-quarter" day that is
associated with the more traditional seasonal markers that were once
the traditional days for serfs to pay rent to their feudal masters.
Today we still celebrate two other cross-quarter days when we go
trick-or-treating for Halloween or await the prognosticative powers of
a large indigenous rodent on Groundhog Day. The final cross-quarter
day, Lammas, which falls on August 1st,is now largely forgotten.
The absence of the Moon from the evening sky now begins to allow us to
once again explore the more subtle sights of the springtime
constellations. The flashy stars of winter now meet the western
horizon as twilight ends, leaving behind a sky full of generally
fainterstars. These stars form some very familiar patterns, though,
and by 10:00 pm you should have no trouble spotting the Big Dipper and
Leo, the Lion on the meridian nearlyoverhead. To the east you'll see
thebright rosy star Arcturus, and to the southeast the bright star
Spica followed by the golden glow of Saturn. The general area of the
sky bounded by these objects is the"Realm of the Nebulae", the heart
of the Virgo Galaxy Cluster. Point asix-inch aperture telescope at
almost any spot in this part of the sky from a dark location and
you're almost sure to run into the fuzzy smudge of light that betrays
one of these many distant places.
Bright Jupiter now dips below the horizon well before 11:00 pm. He
still dominates the western horizon as soon as evening twilight
begins, but getting a good view of him through the small telescope is
becoming increasingly difficult as his light passes through more of
ouratmosphere. His apparent disc has also become much smaller, and now
subtends just 33 arcseconds, as opposed to his maximum of 48
arcseconds at opposition.
Saturn quickly steps in to fill Jupiter's void. The ringed planet
hasjust passed his opposition, so he rises just before sunset and is
in the sky all night long. By 10:00 pm he should be high enough to get
a good look in the telescope, and as he heads toward the meridian for
transit just after midnight he shouldgive you several hours of
observing enjoyment. The planet's rings are tipped about 20 degrees to
our line of sight, and a good three-inch telescope should show the gap
in their outer edge known as Cassini'sDivision. This gap is caused by
a gravitational resonance between several of the planet's inner
moons.This resonance causes periodic disturbances to any ring
particles that happen to stray into the gap area. To give you a sense
of the scale involved, the gap is about as wide as the diameter of the
Earth!

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