The editors of Sky & Telescope make every effort to provide accurate information, but errors do sometimes slip through. We correct all mistakes online as well as printing corrections in the magazine. So if you see something questionable in the magazine, check below to see if it's a known problem.

This article lists all known errors in issues of Sky & Telescope for 2021. See also the errata listings for other years.

January 2021

Page 6: Joel Marks’s observation of a geostationary satellite was made with an unguided telescope, and his impression was that the geosat appeared to move through the background stars even though the satellite was itself motionless in the eyepiece field.

Page 64: Saint Raphael is from the Book of Tobit. Therefore, all of Julius Schiller’s constellations in the Southern Hemisphere are from the Old Testament.

February 2021

Page 18: The table in “Catching Celestial Butterflies” should have stated that M76 lies at +51° 34’.

Page 72: Discounting political alterations, time zones are centered on even 15° meridian lines. They don’t begin and end on those lines as stated in “Finding North by Day."

March 2021

Page 63: PuWe 1 is not the largest known planetary nebula, as stated in “Springtime Blossoms,” but it is one of the largest planetaries known.

April 2021

Page 17: An electron went missing from Branch 2 of the “Rare Reactions” diagram. The electron combines with a proton in Beryllium-7 to produce Lithium-7 and a neutrino.

May 2021

Page 38: The Rapid Approximate Spectral Calculations for All project is not an offshoot of the All Small Molecules project but rather an independent project created by Clara Sousa-Silva in 2016.

Page 58: The “Marly” telescope’s Campani lens referred to in “Giovanni Domenico Cassini and the Birth of Big Science” had a focal length of 136 feet (41 meters).

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