Astronomy Picture of the Day ·

Henrietta Leavitt Calibrates the Stars

The Astronomy Picture of the Day for September 3, 2000 is “Henrietta Leavitt Calibrates the Stars,” an image. It is credited to Credit: AAVSO. The original explanation runs about 84 words.

Henrietta Leavitt Calibrates the Stars
Credit: AAVSO Shown from science.nasa.gov. Not hosted by OpenOrbit.

From the explanation

“Humanity’s understanding of the relative brightness and variability of stars was revolutionized by the work of Henrietta Swan Leavitt (1868-1921). Working at Harvard College Observatory , Leavitt precisely calibrated the photographic magnitudes of 47 stars to which all other stars could be compared.”

— APOD editors, September 3, 2000

Read the full explanation on science.nasa.gov

At a glance

Date
September 3, 2000
Type
Image
Credit
Credit: AAVSO
Copyright
No copyright notice on the entry. Check the credited institution’s own usage rules before reusing it.
Explanation length
About 84 words

All of September 2000 → · 2000 by month → · Full archive since 1995 →

On this day: September 3 in other years

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Source

Copy taken Oct 28, 2026, 2:39 AM EDT. The image and explanation belong to their creators. OpenOrbit is not affiliated with or endorsed by NASA.