Mercury Again.

Well if you didn’t catch Mercury last week when it was on top of Jupiter, this week it’s at his highest above the western horizon, to night is its highest point. Mercury will be quite a bit higher than Jupiter until the weekend when it will rapidly fall into the horizon, Mercury does rather flip around, this is because it’s so close the sun and has an 88 day year, so by the time we get to mid summer’s day it will be back where it is now.

Venus shines low in the southeast during dawn, lower each week, you can still see it, unless Dean was lying, he claimed to have seen over Peninis last week, I wouldn’t know the planet of love sets at least 4 hours before I get up at the moment. But Venus is getting closer to the Sun all the time and will soon disappear.

This is all getting a bit sad because we are about to say goodbye to Jupiter as well it’s very low in the west and not easily seen. But if you haven’t a enough of it since September All you need is a clear evening and a viewing site with an good view down to the west horizon.  Note the spot where the Sun sets, wait another 15 minutes, and then start scanning above that spot for Jupiter and Mercury. Mercury is still about 12° — two binocular fields — above the horizon a half hour after sunset.

But they will all come back, in fact Venus, Mars and Jupiter all rise around 5 am on the 16^th of May and a week later Mercury joins them, so set your alarms.

And of course Mars is still out of sight behind the glare of the Sun.

Saturn rises around 8 p.m. It's highest in the south around 1 a.m. daylight saving time. Spica, slightly fainter, shines about 10° below Saturn all evening.

There is something else we can look out for, these next two weeks, when there's no moonlight in the sky at the end of twilight, are a chipper time to look for the zodiacal light. As the last of twilight is fading away, look for a vague but huge, tall, narrow pyramid of pearly light extending up from the western horizon. It slopes to the left, following the ecliptic. What you're seeing is interplanetary dust near the plane of the solar system, lit by the Sun.

That was your night sky for the week ending 1974^th anniversary of Caligula accepting the titles of the Principate, entitled to him by the Senate. He was initially reluctant to accept but his horse said he would have to sleep on the sofa if he didn’t, so he did.