Astronomy Picture of the Day · April 26, 1999

USNO-A2.0 Catalog: A Digital Sky

The Astronomy Picture of the Day for April 26, 1999 is “USNO-A2.0 Catalog: A Digital Sky,” an image. It is credited to Credit: PMM Team, USNO Flagstaff Station. The original explanation runs about 144 words.

From the explanation

“Here lie 526,230,881 of the brightest stars known. The US Naval Observatory has deployed their monster Precision Measuring Machine to digitize photographic plates covering the whole sky and creating the above map .”

— APOD editors, April 26, 1999

Read the full explanation on science.nasa.gov

At a glance

Date: April 26, 1999
Type: Image
Credit: Credit: PMM Team, USNO Flagstaff Station
Copyright: No copyright notice on the entry. Check the credited institution’s own usage rules before reusing it.
Explanation length: About 144 words

All of April 1999 → · 1999 by month → · Full archive since 1995 →

Topics in this entry

The Milky Way Galaxies

Topics are matched from words in the title and explanation.

On this day: April 26 in other years

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Source

Astronomy Picture of the Day, April 26, 1999 — science.nasa.gov/image-article/apod-1999-april-26-usno-a2-0-catalog-a-digital-sky

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.