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One fun way to observe planets is to watch how they move in front of the constellations of the Zodiac. The Greek phrase asters planetai means wandering star. Over the span of weeks or months you can see how planets move, while the stars stay in the same position relative to other stars. In the coming weeks, watch how Mars moves away from the star Regulus and toward the star Spica and planet Saturn.

Spica is a whirling double star

To help you notice the movement you can use your hand as a distance marker. Hold your hand at arm's length: your pinkie held up is one degree, three fingers is five degrees and your fist is 10 degrees. For practice notice how Mars appears to slowly get closer to Saturn over the next two months. Mark the distance each week or so. If you are really patient you can watch them until Mars and Saturn reach conjunction in mid-August 2012. At that time they'll appear closest together in the sky.

For tonight, May 28, enjoy the view of the first quarter moon and the red planet Mars in the evening sky.