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 2019. See also the errata listings for other years.

January 2020

Page 28: The sundial diagram illustrating the Sun's position at various times and dates incorrectly showed the hour lines radiating from the zenith. They actually radiate from the north celestial pole.

Sundial
Gregg Dinderman / S&T

Page 53: J. Wesley Simpson photographed Kordylewski's clouds aboard NASA's Convair 990 laboratory aircraft in 1966, not aboard its Kuiper Airborne Observatory in 1967.

March 2020

Page 60: A six-minute error in determining Greenwich Time would lead to a navigator's error of 90 nautical miles, not six, when sailing near the equator.

Page 61: When computing longitude, one should subtract Greenwich Time from local time and multiply by 15, not divide.

April 2020

Page 33: In the sidebar of "A Curious Straight Ray," under "Making simplifications," the editors oversimplified, and c is missing from the numerator of the first equation's right side. It reappears, though, in the solutions beneath.

Page 53: On the elevation graph of the Orientale basin the average elevation is in meters not kilometers. See the correct graph below.

Orientale basin on the Moon's farside is about 7km deep. That's how thick a filling of lava it would take to make it look like Mare Imbrium, with only the highest peaks of Montes Cordillera visible.
Gregg Dinderman / S&T

May 2020

Page 17: On asteroid Ryugu, the unexpectedly large crater left by Hayabusa 2's projectile was a result of the rocks' low density and the asteroid's weak gravity.

June 2020

Page 48: In “A Martian Sneak Peek,” the acronym ALPO stands for the Association of Lunar and Planetary Observers alpo-astronomy.org.

July 2020

Page 45: In “Ophiuchus Treasures,” the correct number of Messier globular clusters in Sagittarius is seven.

Page 49: In the "Path of Pluto" chart, SAO 188414 was mislabeled as SAO 1888414.

October 2020

Page 7: In this magazine’s Astronomical Scrapbook, “The Field of Mizar and Alcor” (S&T: Apr. 1957, p. 265), the star that wasn’t a planet should have been called Sidus Ludovicianum or Stella Ludoviciana.

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