¡SkyCaramba! Weekly astronomy blog for the week of September 20 to 26, 2015
I hope you’ve been watching Mars and Venus in the morning sky. A crescent moon passed between then on the 10th with Mars on the left and Venus on the right. The planets are both moving eastward compared to the stars behind them. However, they are rising a little earlier each day. Northern hemisphere sky watchers can see them a little longer each morning, because the sun is rising later each day.
As this week starts, you see that Mars is closing in on Regulus and Venus is pulling away from Acubens. If you have a clear enough horizon, you should also see that Jupiter is about to join the show. You’ll find the big planet at Leo’s belly.
Jupiter’s appearance here is a trick of perspective. It too is moving eastward compared to the stars behind it. But the stars are rising earlier and so is Jupiter. For northern hemisphere observers, it’s becoming visible a little longer each morning mostly because of the later sunrises.
On the 24th, Mars will be closest Regulus. The two will be less than one degree apart with Mars on the ...