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Mountain Skies
By Dr. Bob Doyle
In the first week of fall, the Harvest Moon shines in the watery star
groups of Aquarius and Pisces. The full moon in October features a late
evening lunar eclipse on October 27th, a Wednesday. The evening sky is
planetless until December when Saturn appears in the East.
In early November, the two brightest planets, Venus and Jupiter line up
low in the eastern dawn. Good meteor showes in fall 2004 include the
Orionids on the morning of October 21st and the Geminids on the morning of
December 13th. Dawn sky gazers can see a crescent moon - Venus line up on
the mornings of September 10, October 10, November 9 (Jupiter too) and
December 9.
In early fall (starts on September 22nd this year), the full moons offer
extra evening moonlight. For at this time of the year, the moon’s orbit is
at a low angle to the eastern horizon, halving the usual 50 minute delay
in moonrise from night to night. On the night of September 27-28, we have
the Harvest Moon, the full moon that lingers longest in the early evening
sky. Through the end of September, the moon will rise before the night sky
turns dark. In late October, we have the Hunters’ Moon, a near re-run of
the Harvest Moon. But late in the evening of October 27th, there will a
total lunar eclipse starting at 10:23 p.m. (At this time, the moon will be
completely in the Earth’s deep shadow or umbra.) For the rest of October,
there will be plenty of moonlight in the early evening sky, including
October 31st (Halloween).
The lunar eclipse in the late evening of October 27th deserves special
notice. This is the year’s second lunar eclipse for this area. (The first
lunar eclipse on May 4th was obscured by clouds.) A lunar eclipse occurs
when the moon goes into the Earth’s large shadow. A lunar eclipse poses no
danger to your eyesight. During most lunar eclipses, the moon at mid
eclipse appears grey or orange. The strange hue is due to the only light
reaching the moon having had to travel around the edge of the Earth and
through our atmosphere. The moon will be deepest in shadow on 11:04 p.m.
By 11:45 p.m., the moon will begin to emerge from the Earth’s shadow and
begin to brighten on its left edge.
November’s full moon will occur on the night of November 26-27 on the day
after Thanksgiving. For the next few nights, the moon will be near the
star group Orion in the eastern evening sky. As November ends the moon
will be near the planet Saturn, low in the eastern evening sky.
A meteor shower occurs when the Earth plows across the orbit of a comet,
littered with debris. Two fall meteor showers will be favorable this fall
because the moon will be an evening object, avoiding the morning sky.
(Meteors appear brightest in the AM hours when the meteors strike the
Earth head-on.)
The meteor shower on the early morning hours of October 21st is known as
the Orionids, appearing to streak from the star group Orion. (Orion is a
group known for its three striking stars in a row (Orion’s belt).) On
December 13th at dawn, the Geminids blaze out. (Gemini is a star group
that appears above and to the left of Orion.)
For further information (such as free sky map or a beginner’s guide to the
sky), call the Frostburg State Planetarium at (301) 687-4270 and listen to
the menu.
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