Venus, Jupiter, and Mercury to align in the late sky

The two brightest planets, Jupiter and Venus are projected to crowd the sky this weekend with their paler cousin, Mercury, along with a bonus crescent moon.

If the weather is clear this weekend, even those who normally do not look at the sky may be struck by a dazzling celestial scene in the west after sunset: a view of two bright planets and an even more eye-catching crescent moon.?

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The two brightest planets, Venus and Jupiter, will accentuate the beauty of the slender crescent moon on Saturday and Sunday (Feb. 25 and 26). The planet Mercury may also be visible too, low on the horizon, beneath Venus depending on your sky conditions, but it will disappear quickly after sunset. ?

Even if your local weather brings clouds or rain, you can still watch Venus, Jupiter and the moon align online via online broadcasts.

Venus, the "Queen of the Sky," can put on a show all by itself, at times far outshining any other object in the night sky except for the moon. It's so bright that you can even glimpse it in the daytime ? if you know exactly where to look.

The sky maps of Jupiter and Venus for this story show how the planets and the moon will appear together on Saturday and Sunday. Astronomers call this cosmic arrangement a triple conjunction.

Early Saturday afternoon, if your sky is clear and blue, try locating the crescent moon at around 1 p.m. local time. It will be roughly two-thirds up from the southeast horizon to the point directly overhead.?

If you find it, look a short distance directly below it to find Venus. The planet should appear as a tiny white speck against the blue daytime sky. At dusk, the pair will make for a beautiful sight, with Venus hovering below and to the moon's left, while much higher above and to the left of this dynamic duo will be Jupiter. [Photos: Amazing Views of Jupiter, Venus & Moon]

On Sunday evening, the moon will have moved up, almost to where Jupiter is, sitting off to the lower right of the bright gas giant planet.

Another planet is also gracing the night sky in addition to Venus, Jupiter and Mercury: Mars. The Red Planet is currently rising in the eastern sky a few hours after sunset.

This weekend's dazzling skywatching show is a good occasion to reflect on the astronomical history associated with Earth's moon.

It has been said that the calendar is humanity's first scientific invention and the moon has played an important role in this regard. Calendars, such as the ones used in the Jewish and Muslim faiths, have lunar months that begin on the evening when the crescent moon first appears in the western sky at sundown. ?

For instance, the moon's so-called "Knife of Time" hung low in the western twilight sky on Thursday (Feb. 23), heralding the opening of Adar, the sixth month of the year 5772 in the Jewish Calendar. This arresting classification of the young crescent moon aptly characterizes how the moon's phases and cycle seemingly cut the year into convenient segments. [Infographic: Moon Phases & Lunar Cycle]

Astronomers define the "new moon" as that moment when the moon occupies the same ecliptic longitude as the sun. Since the moon is then in close proximity to the sun in the sky, it cannot be seen (unless in silhouette during a solar eclipse).

In popular parlance, the term "new moon" refers to when the moon appears as a narrow sliver over the next few evenings, adding delicate beauty to the western twilight as a thin arc of light enclosing a ghostly ball. Here was the signal by which the ancients set their calendars.?

But how is it that we can see the entire outline of the moon when it's in its crescent phase? To answer this question, let?s imagine ourselves as astronauts on the surface of the moon.

Source: http://rss.csmonitor.com/~r/feeds/science/~3/Od-XB-jvmMU/Venus-Jupiter-and-Mercury-to-align-in-the-late-sky

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