Posts by 

Guy Ottewell

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.

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.

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.

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.

Helioconjunction of Jupiter and Neptune on June 6

There will be a helioconjunction of Jupiter and Neptune on June 6, 2022. That is, as seen from the sun, Jupiter will overtake Neptune.

Constellations and signs: what’s the difference?

What is the difference between signs of the zodiac and constellations of the zodiac? Astronomer Guy Ottewell illustrates and discusses this difference.

Double star orbits: New charts of Sirius and Albireo

Learn more about the double star orbits of 2 famous stars - Sirius and Albireo - with these fascinating charts from Guy Ottewell.

Venus passages compared: 2017 to 2022

Venus will sweep near the sun in our sky (inferior conjunction) on January 8-9. Astronomer Guy Ottewell uses his great skill at illustration to compare this with past Venus passages.

Past-and-future Earths ring in New Year

Past-and-future Earths. A novel way of picturing ourselves riding on Earth, orbiting the sun, from astronomer Guy Ottewell.

The late June evening sky is rich

Here are charts showing the late June evening sky in 2021, from master chartmaker Guy Ottewell. One looks west after sunset. One looks from above.