Astronomy Picture of the Day ·
Follow The Spots
The Astronomy Picture of the Day for October 21, 1999 is “Follow The Spots,” an image. It is credited to Credit: Louis Strous (LMSAL), SOHO – MDI Consortium, ESA, NASA. The original explanation runs about 121 words.
From the explanation
“The Sun rotates on its axis about once every 27 days. How can you tell?”
— APOD editors, October 21, 1999
Read the full explanation on science.nasa.gov
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At a glance
- Date
- October 21, 1999
- Type
- Image
- Credit
- Credit: Louis Strous (LMSAL), SOHO – MDI Consortium, ESA, NASA
- Copyright
- No copyright notice on the entry. Check the credited institution’s own usage rules before reusing it.
- Explanation length
- About 121 words