April 12, 2003
If the universe seems cold from a distance, birthdays are part of its rebuttal.
Mercury on the Horizon
Birthday · April 12, 2003
A little universe, just for you
Your date.
Ready to give.
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APOD published April 12, 2003. Credit: Juan Carlos Casado. A publication-date match, not a photo taken on your date. Independent of NASA.
Have you ever seen the planet Mercury? Because Mercury orbits so close to the Sun, it never wanders far from the Sun in Earth's sky. If trailing the Sun, Mercury will be visible low on the horizon for only a short while after sunset. If leading the Sun, Mercury will be visible only shortly before sunrise. So at certain times of the year an informed skygazer with a little determination can usually pick Mercury out from a site with an unobscured horizon. Above, a lot of determination has been combined with a little digital trickery to show Mercury's successive positions during March of 2000. Each picture was taken from the same location in Spain when the Sun itself was 10 degrees below the horizon and superposed on the single most photogenic sunset. By the middle of this month, Mercury will again be well placed for viewing above the western horizon at sunset, but by the end of April it will have faded and dropped into the twilight. On May 7th, Mercury will cross the Sun's disk.
Image credit: Juan Carlos Casado