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Posts by
Guy Ottewell
Comet C/2021 T4 Lemmon is sweeping through southern skies
Comet C/2021 T4 Lemmon was discovered at Mount Lemmon Observatory in 2021. It's currently in the southern skies and might become bright enough for binoculars.
June 4, 2023
How many red dwarf stars in nearby space?
Astronomer Guy Ottewell uses 2 charts - showing 2 different volumes of space - to contemplate and question the density of red dwarf stars in our Milky Way.
May 23, 2023
Artificial intelligence: Thoughts by astronomer Guy Ottewell
Renowned astronomer Guy Ottewell weighs in on artificial intelligence. Plus, apparently what AI says about him isn't accurate.
May 11, 2023
The Drake Equation and the late planet
Astronomer Guy Ottewell discusses how the recent discovery of a star swallowing a late planet can help refine an estimate for part of the Drake Equation.
May 9, 2023
The attitude of the Swan and the Northern Cross
Guy Ottewell answers the question: Since the Northern Cross is vertical as it sets in the west, why is it not also vertical as it rises in the east?
March 17, 2023
How fast is daytime growing? Guy Ottewell explains
How fast is daytime growing? A table in this post shows differences in the time of sunrise as we approach the March equinox.
March 16, 2023
The 5 petals of Venus and its 8-year cycle
Learn about the 8-year cycle of Venus in our sky and the petals of Venus, a rhythmic motion of Venus when viewed from an Earth-centered perspective.
January 22, 2023
The green comet: Comet 2022 E3 ZTF
Learn about the trajectory of the green comet - Comet 2022 E3 ZTF - by the renowned astronomer Guy Ottewell. The comet will be closest to Earth on February 2.
January 17, 2023
Northern autumn ahead. Here’s your equinox sky
Northern autumn arrives on September 22 or 23, 2022, with the equinox. The time and date depend on precisely where you live. Find out more here.
September 20, 2022
Full and near moon July 13
Learn more - and see charts - related to the July 13, 2022, nearest full moon of 2022 from master chart-maker Guy Ottewell.
July 11, 2022
