It’s equinox time again, and this year’s March equinox took place today at precisely 5:14 a.m. GMT, or Universal Time (13:14 in Manila). The March equinox was also known as the “spring equinox” in the northern hemisphere and “autumnal (fall) equinox” in the southern hemisphere as this event marks the change of seasons — the beginning of spring in the northern part of the globe and autumn in the south.
During equinox, night and day are nearly exactly the same length – 12 hours – all over the world. This is the reason it’s called an “equinox”, derived from Latin, meaning “equal night”.
However, even if this is widely accepted, it isn’t entirely true. In reality equinoxes don’t have exactly 12 hours of daylight. A good website for looking at sunrise and sunset times in Manila can be found here. The best one for checking the bearing (direction) of sunrise or sunset anywhere in the world is the US Naval Observatory.
A more appropriate way to define equinox is given by astronomers. According to its astronomical definition, an equinox is the moment when the sun arrives at one of two intersection points of the ecliptic, the sun’s path across the sky, and the celestial equator, earth’s equator projected onto the sky.
My plans today were to head on the top of a high place and catch the sun setting due west. Sadly, the weather was not very good and the visibility was terrible.
Had I been able to see the sun it would have set due west.
Everyone always says that the sun rises in the east and sets in the west, but if we were really aware of our surroundings and more attuned to the sky we would realize that this is not true. In fact this is only true for two days out of the entire year and those are during equinoxes.
By studying the sun’s position in the sky over the course of a year from the same location, one can notice that its rising and setting positions are changing by more at a particular time of year than at any other time.
The amount of change in the location of the rising and setting of the sun throughout the year depends upon where your viewpoint is. However, irrespective of where you are on the globe, the Sun will always rise exactly east and set exactly west during equinoxes (on March 20/21 and September 20/21)
On the other hand, near the solstices the sunrise position slows its change to close to a ‘standstill’ (the name ‘solstice’ being derived from the Latin for ‘sun standing still’).
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Seasons Without Borders: Equinox March 2012
Wherever you are on 20 March, 2012, celebrate your season in the cycle of life with Astronomers Without Borders. Enjoy your own unique Equinox this year—and why not tell others about the experience? Being mindfully aware of your place on this moving Earth may bring out the storyteller and poet in you. AWB invites you to share your event reports and poems at the AWB Members’ Blog and AWB Astropoetry Blog. Send your poems to: firstname.lastname@example.org.
Global Astronomy Month 2012 (www.gam-awb.org) is merely a month away. Astronomers Without Borders (AWB) has organized three exciting events in March to do the warm-ups!
Spread the word and join in.
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“Hello Red Planet”
3-5 March 2012
Mars will come into Opposition on March 3, 2012 in the constellation Leo with its face fully illuminated by the Sun and two days later, on March 5, 2012, the planet will have its closest approach to Earth during this apparition: 100.78 million km (0.6737 AU)—the best time to say “Hello” to the Red Planet.
“Conjunction of Glory”
13 – 15 March 2012
Venus and Jupiter, the two brightest planets in the sky, will be within 3 degrees of each other in the evening sky of 15 March 2012 at 10:37:46 UTC. This will be quite a spectacle, as both planets are very bright—and this will be a fantastic visual and photographic opportunity, as it’s not often that you get the brightest planets in our Solar System so close together.
The next Venus-Jupiter conjunction after this one falls on May 28, 2013.
“March Equinox 2012”
20 March 2012
The March equinox occurs at 05:14 UTC, Tuesday 20 March. The Sun will shine directly down on the Earth’s equator and there will be nearly equal amounts of day and night throughout the world. This is also the first day of spring (Vernal Equinox) in the northern hemisphere and the first day of fall (Autumnal Equinox) in the southern hemisphere.
Wherever you are on 20 March, 2012, celebrate your season in the cycle of life with Astronomers Without Borders. Enjoy your own unique Equinox this year—and why not tell others about the experience?
To the stars! 🙂
More about GAM 2012: