News

Did the ancient Egyptians record the period of eclipsing binary Algol?

18 December 2015 Astronomy Now

A scholarly investigation of the Cairo Calendar papyrus (1244–1163 B.C.) has led researchers at the University of Helsinki to conclude that the ancient Egyptians were aware that the variable star Algol (beta Persei) had a 2.85-day period. Given that the star’s current period is 2.8673 days, this supports the theory that mass transfer between the stars of this eclipsing binary has caused a long-term increase of its orbital period.

Observing

Perseid meteors set to light up 12-13 August skies

7 August 2015 Astronomy Now

From the evening of Wednesday, 12 August into the early hours of the following morning, it is the maximum of the annual Perseid meteor shower. This year, a new Moon makes prospects for watching this natural firework display particularly good. So, find somewhere away from the streetlights, settle into a garden lounger facing northeast, and enjoy the show!