PCC News Monthly October 2017 | 页面 6

The Sky This Month Welcome to our night-time sky. Please enjoy this monthʼs tidbits of knowledge. We are lucky to live in a dark-sky area where the heavens can shine through. I hope you enjoy the sky and perhaps learn a thing or two. Happy star gazing! Orionʼs Coming – Here is a sight for all of you stay-up-laters. The Orionid meteor shower peaks on the morning of October 20. Orion will rise in the east around 11pm and lots of meteors will be shooting out of Orionʼs head. If all goes to plan, you might see 10-15 meteors per hour. These dust specs are from the tail of Halleyʼs Comet and will be hitting the atmosphere at 147,000 miles per hour. The bonus this year is that the moon is new (i.e., dark), so the sky will be nice and dark. Actually, you can watch the meteor shower over several nights before and after the 20th. Since comets have long tails, the debris field is quite large. You can also watch into the morning hours when Orion will be more overhead. Sky Pyramids – Did you know that the ancient pyra- mids in Giza, Egypt may have a direct link to the stars? 6 October 2017 pccnews A man named Robert Bauval who was born in Alex- andria, Egypt, developed the idea. One night in 1983, while working in Saudi Arabia, he took his family and a friendʼs family up into the sand dunes of the Arabian Desert for a camping expedition. His friend pointed out Orion, and mentioned that Alnitak, the smaller more easterly of the stars making up Orionʼs belt was offset slightly from the others. Bauval knew that the smallest pyramid in Giza was also slightly offset from the others. He made a connection between the layout of the three main stars in Orionʼs belt and the layout of the three main pyramids in the Giza. Bauval compared the layout of the pyramids and the Nile as compared to Orion and the Milky Way. Their positions were a close match, but not the revelation that he expected. Bauval then realized that the Earth changes its orienta- tion to the stars over time. By turning the clock back to 10,450 B.C., Bauval found a near exact match. The pyra- mids lined up exactly with Orionʼs belt and the Nile lined up exactly with the Milky Way. You can catch a view of Orion in the eastern sky in the late evening. — Brian Biggs Amateur Astronomer