Tracking the sun's yearly movement over Antarctica
TUCSON, AZ (Tucson News Now) - Today's NASA Astronomy Picture of the Day is an analemma. This is when an image of the sun is snapped from the same spot over the course of a year to show how the sun moves through the sky.
In the image below, that spot is near the Concordia Station in Antarctica. The images were snapped at 4 p.m. each day. According to NASA this may be the first analemma from Antarctica.
The image shows the sun's position only from September through March because during the rest of the year the sun does not creep above the horizon. When it is summer in the northern hemisphere, it is winter in the southern hemisphere, where Antarctica is located. That is when this frozen continent spends many months in darkness or twilight. Once the sun rises above the horizon with the equinox today, it will not set from the sky until the next equinox in March.
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