Full "Super" Moon over San Francisco
“According to U.S. clocks, May 5, 2012 features the closest and largest full moon
of this year. Astronomers call this sort of close full moon a perigee full moon.
The word perigee describes
the moon’s closest point to Earth for a given month. But last year, when the
closest and largest full moon occurred on March 19, 2011, many used a term astromers had never
heard: supermoon. We’ve heard this term again at this 2012
close full moon. What does it mean exactly? And how special is the May 5,
2012 supermoon?
At perigee, the
moon lies only 356,955 kilometers (221,802 miles) away. Later this month, on
May 19, the moon will swing out to apogee –
its farthest point for the month – at 406,448 kilometers (252,555 miles)
distant. So you can see tonight’s moon really is at its closest.
The
supermoon of March 19, 2011 (right), compared to an
average moon of December 20, 2010 (left). Will you be
able to notice with your eye alone that tonight's full moon is bigger or
brighter than usual? Astronomers say no, but it'll be fun to stand outside
under tonight's full moon and know the moon is closer than it has been since March 19, 2011. Image Credit: Marco Langbroek, the Netherlands, via Wikimedia Commons.
How often is the moon in perigee? The time period between the perigee moon is
equal to about 1 year, 1 month, and 18 days. The full moon and perigee will
realign again on June 23, 2013, because the 14th full moon after today’s
full moon will fall on that date. Closest full moons recur in cycles of 14
lunar (synodic) months:
Moon closest to Earth
Year
|
Date
|
Distance
|
2011
|
March 19
|
356,575 km
|
2012
|
May 6
|
356,955 km
|
2013
|
June 23
|
356,991 km
|
2014
|
August 10
|
356,896 km
|
2015
|
September 28
|
356,877 km
|
Will the tides
be higher than usual? Yes, all full moons bring higher-than-usual tides, and
perigee full moons bring the highest (and lowest) tides of all. Each month, on
the day of the full moon, the moon, Earth and sun are aligned, with Earth in
between. This line up creates wide-ranging tides, known as spring tides. High spring tides climb up
especially high, and on the same day low tides plunge especially low.”
So much for the background of
the ‘supermoon’.
Well, together with many
photographers, I decided to go up to San Francisco in search of a good viewing point to experience the
closest moon. Thanks for Steven
Christenson of Star Circle Academy [www.starcircleacademy.com],
I had a couple of places where I could view the moon rising over the Bay Bridge and choose the closest on Pier 7 at the City
Waterfront.
I explored Coit Tower as well since the elevation might offer a better
vintage point but the vegetation around Telegraph Hill is too dense to have a
clear view of the bridge. Back on Pier 7
as the time of moon rise approached, photographers geared with tripods and
cameras gathered at Pier 7 to watch the show.
At 8pm very shortly before the moon rise, the San Francisco Bell – a
Hornblower dinner cruise – left its mooring on Pier 5 and we were all concerned
whether the big slow-moving shuffle boat would block the view just when we were
expecting the moon to rise.
Coit Tower from Pier 7 later that evening.
Well, it did
not happen and the Belle was out of view before the moon appeared over the
horizon. The next 1 hour you could hear the clicking of camera
shutters continuously and it was truly a bright sight to see. It always amazes me how fast the moon rises
over the horizon and I observed it traversing behind the Baybridge and almost
filling the space between the span and the cables.
Sailing the Bay under a full moon
Hornblower cruise ship under the Bay Bridge
Coit Tower from Pier 7
Later, the lights on the city waterfront started to illuminate the water with beautiful reflections and I couldn’t resist creating the night panoramas below.
Night Panorama at the Waterfront
I hope you had a chance to go out and look up to the full moon. It was a beautiful, unusual warm and balmy night and the City presented itself at its best.
Til next Time,
Meggi
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Spring has come and the Hummingbirds in the Santa Cruz Mountains are out in full. Please join Judy and me for the upcoming Hummingbirds Photo Workshop [click for more information].
June 3, 2012 (1st level)
July 22 (advanced)
September 16 (1st level) and 23 (advanced)
Instructors: Meggi Raeder and Judy Bingman