Friday, September 08, 2006

Ahhh, the Moon!

September 2006 features the first northernmost moon of the century, as well as the closest full moon and farthest new moon of the year. In addition, a partial lunar eclipse at full moon, September 7, and an annular solar eclipse at new moon, September 22, will also occur.

Northernmost Moon


Northern and southernmost moons come in cycles of approx 19 years. The last northernmost moon fell on September 15, 1987; the next will occur March 7, 2025. This year the northernmost moon is on September 14 EDT. In the U. S., except Alaska, the moon will be underneath the horizon at this time.
Closest Full MoonFull moon occurs the night of September 7-8; of all the full moons this year, this moon aligns most closely with perigee, the closest monthly approach to the earth. A full or new moon coinciding with perigee brings forth a perigean spring tide, which further accentuates the extreme monthly variation between high and low tides.


Farthest New Moon


At it's apogee, point in the moon's orbit farthest from earth, the moon is directly between the earth and sun. Since sunlight only illuminates the far side of the moon, it appears dark or faintly visible from earth.
Partial Lunar Eclipse A lunar eclipse occurs when the earth's shadow falls over the moon. Lunar eclipses occur, on average, about every 6 months. When only part of the moon enters the earth's umbra, darker core of shadow, a partial eclipse will result.


Annular Solar Eclipse


The September 22 new moon and sun are in perfect alignment, therefore a visible ring, or annulus of sunshine, surrounds the moon at this time. This is called an annular solar eclipse, which is significant to the northernmost moon because it occurs so close to the September 23 equinox.

-attributed sources
http://www.idialstars.com/smoon.htm http://home.hiwaay.net/~krcool/Astro/moon/moonpedia/

Thanks to Jnxrtist!

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