Astronomy Picture of the Day
Four Towers and the Equinox Moon
Four Towers and the Equinox Moon
2019 March 23

Explanation: The first Full Moon of northern spring rises behind four distant towers in this telescopic view. In an image captured from some 40 kilometers west of the city of Madrid, this moonrise also represents a near coincidence of the full lunar phase with lunar perigee and the March equinox. Close to the horizon, the Full Moon's strangely rippled and distorted shape has more to do with the long sight-line through a layered atmosphere, though. Tantalizing visible effects of the substantial atmospheric refraction include the appearance of a thin floating sliver just above the lunar disk. The remarkable optical mirage is related to the more commonly witnessed green flash of the setting Sun.

  High Resolution Image
Tomorrow’s Image: ancient star cluster
Credit & Copyright: Javier Martinez Moran
 Courtesy of Astronomy Picture of the Day Index - Main Page & Astronomy Picture of the Day


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