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The heavens this week
Apr. 22nd, 2013 12:25 pmStudents -
It looks like tonight will be quite clear, so I’ll have the tower open as soon as it’s dark. I’ll also be available for the usual conversation and questions about astronomy and related topics. (Though, you know me. I think everything’s related to astronomy. Come ask why, if you like.) I will be out Tuesday evening for a Guild meeting, but available the rest of the week as well.
The Lyriad meteor shower is currently ongoing - I was up watching for a bit before dawn, and it was not as impressive as some years, but easier to watch after moonset.
On Thursday, there will an lunar eclipse, beginning just before 8 at night. While this particular one is not deeply interesting (being very brief and extremely partial - only about half an arc second will be occluded) it is interesting because it is the last of a saros series.
We do not normally discuss these except in my newt years, but eclipses occur in a pattern, stretching over 18 years (18 years, 11 days, 8 hours, to be precise). We can use the larger series pattern to predict both when eclipses may occur, and what form they will take, due to the interactions of three separate sequences (The synodic month, the draconic month, and the anomalistic month. For the curious, the name of the middle of those three comes from old legends about a dragon eating the moon at the eclipses.)
This is the first series I’ve had the opportunity to observe in full (given weather, of course), but I also have my notes from the last half of the previous cycle (and of course, my predecessor’s observing journals, which cover cycles long before that) for anyone interested in comparisons.
It looks like tonight will be quite clear, so I’ll have the tower open as soon as it’s dark. I’ll also be available for the usual conversation and questions about astronomy and related topics. (Though, you know me. I think everything’s related to astronomy. Come ask why, if you like.) I will be out Tuesday evening for a Guild meeting, but available the rest of the week as well.
The Lyriad meteor shower is currently ongoing - I was up watching for a bit before dawn, and it was not as impressive as some years, but easier to watch after moonset.
On Thursday, there will an lunar eclipse, beginning just before 8 at night. While this particular one is not deeply interesting (being very brief and extremely partial - only about half an arc second will be occluded) it is interesting because it is the last of a saros series.
We do not normally discuss these except in my newt years, but eclipses occur in a pattern, stretching over 18 years (18 years, 11 days, 8 hours, to be precise). We can use the larger series pattern to predict both when eclipses may occur, and what form they will take, due to the interactions of three separate sequences (The synodic month, the draconic month, and the anomalistic month. For the curious, the name of the middle of those three comes from old legends about a dragon eating the moon at the eclipses.)
This is the first series I’ve had the opportunity to observe in full (given weather, of course), but I also have my notes from the last half of the previous cycle (and of course, my predecessor’s observing journals, which cover cycles long before that) for anyone interested in comparisons.
