Author Archives: Roger W. Sinnott

Roger W. Sinnott

About Roger W. Sinnott

Roger Sinnott is a senior contributing editor at Sky & Telescope.

New Date for Caesar’s British Invasion

In 55 BC, when Julius Caesar and his fleet approached the white cliffs of Dover on the British coast, he faced unexpectedly strong tides. Researchers from Texas State University have used tidal measurements and other astronomical clues to revise the exact date of the historic landing.

Spring’s Comet Lovejoy

During the next few weeks, early risers in the Northern Hemisphere can follow recently-discovered Comet Lovejoy as it makes its way northward past some familiar telescopic sights.

Earth’s “Other Moon”

Last year Earth's gravity apparently captured a tiny asteroid that ventured too near our planet. But this "second Moon" will only hang around until June, when it'll get shoved back out into interplanetary space.