Ok, in case you were hiding under an astronomical rock, you know that this morning we had a total lunar eclipse. This one was well-positioned for viewing from the West coast of North America, as well as Hawai’i. When I checked the times for the eclipse, I was disappointed, as it looked like I would miss the whole thing; I would have to get up at about 01:30 (Pacific Daylight Time, UTC -7hrs) and stay out until nearly 03:00 to catch it. I get up at 05:00 to make it to work by 06:30. So, I thought it would not be a happening thing for me. However, fate intervened.
I have some problems with my neck. The disks between C5/6 and C6/7 are bulging, hardening, and are pressing on the nerves that feed my right arm (primarily) as well as touching the spinal cord. The neurosurgeon went into excruciating detail about the excruciating pain in my neck, shoulder, and arm. Sometimes I also feel a loss of sensation or tingling on the back of my head and extending around to the right jaw and cheek.
I’m scheduled to have cortisone injections at the end of September, which the doctors hope will reduce the inflammation and allow the disks to heal without surgery. In the meantime I’m trying to find comfortable positions to sleep and work. Every few weeks I get a pack of oral Methelprednisolone, which is great stuff, even though it leaves a nasty taste in my mouth for hours. It so happens that I got one Monday. Now, this stuff, which is a corticosteroid, is taken over the course of six days. The first day you take six, and you reduce the quantity by one each day. Having been in a great deal of discomfort over the weekend, I elected to take all six in the afternoon, which is allowed, but not recommended because it can make you jittery and sleepless.
Guess what? I woke up around Midnight, and was jittery and sleepless.
So, at about 1:30 I wandered out into the back yard and began watching the moon, just because I knew I wasn’t going to get any more sleep than I had done already.
As I was watching the moon, a thought struck me, and I went back in the house for my trusty Palm T/X, and fired up WiFi, and brought up Twitter. You can follow the progress of the eclipse on my Twitter profile, or you can just read the rest of this post.
Here is NASA’s plot of the eclipse which will help explain the point references I will be using below. There’s also a website that explains lunar eclipses for beginners here. Update: Here’s an animation of the eclipse, and here are Charley’s photos of the eclipse. Astroprof also has some pictures.
- P1: The moon contacts the penumbra. The penumbra the partial shadow of the earth, where the sunlight is partially blocked. It is represented by the lightly shaded area of the plot above.
- U1: The moon contacts the umbra. The umbra is the complete shadow of the earth, where the sunlight is almost completely blocked. I say ‘almost’ because the atmosphere of the earth bends the sunlight through it and around the earth, which causes the moon to take on a reddish, coppery color during the period of totality.
- U2: The moon enters totality. It’s also the name of a pretty good band
- U3: U3 is the point at which the moon contacts the far side of the shadow of the earth, and begins to leave totality
- U4: U4 is the point at which the moon breaks contact with the umbra.
- P4: P4 is the point at which the moon breaks contact with the penumbra
According to Twitter, I started my tweets at 9:10 UTC, or 02:10 PDT. I’ll translate the Twitter entries UTC into PDT, and try to paint a word picture of the eclipse.
P1 + 38m
|When I went outside to begin looking the Moon was already in the Penumbra, and almost to the Umbra. It was still very bright. I could see the entire back yard clearly, and I would bet that I could have read a newspaper under the light. I could only see the brightest stars (For example, the summer triangle was visible to the West) and I could not make out Cassiopeia in the North, or anything close to the moon. The sky was awash with moonlight, and I could not see any of the city sky glow. At this point, I decided to use Cygnus as my standard of viewing. At this point, only Deneb is visible in Cyg.|
U1 + 0m
|At the beginning of the contact with the umbra, the moon itself still looked very bright. U1 was marked by the top left limb of the moon beginning to look indistinct and fuzzy. Then the shadow grew from that point until it began to look like someone had carved a thin slice off of that spot on the moon.|
U1 + 20m
|By this point, the moon was about 1/3 into the earth’s shadow.|
U1 + 22m
|Large dark shadow with a faintly reddish edge to it along the upper left (yes, I said ‘right’ in my tweet, blame it on being jittery and sleepless and awake at 02:12) limb. Still very bright outside, can only see the four brightest stars in Cygnus. Can see Vega in Lyra, but none of the other stars. Except for Altair, I still can’t see anything in Aquila, which was fairly close to the moon.|
U1 + 22m
U2 – 38m
|It’s now a lot darker than when I started viewing. At this point I could begin to make out the disc of the moon in the shadowed portion. It appeared first as a slightly less dark semi-circle of sky, but then took on a reddish tinge.|
U1 + 29m
U2 – 33m
|I could make out 8 stars in Cygnus, but some of them only visible by averted vision (a technique of looking slightly to the side of an object of interest, which helps picking up faint objects, or faint details in brighter objects), and because I knew where to look.|
U1 + 37m
U2 – 23m
|50 percent of totality (approximately) I saw something out of the corner of my eye, coming up over the neighbor’s yard to the East, but when I looked at it, it went away. I consulted 2sky (a now defunct planetarium program for the PalmOS), and discovered that I was seeing (barely) the Pleiades. I could only see them in averted vision. By this time I could see 10 stars in Cygnus.|
U1 + 43m
U2 – 17m
|A dark disk with dark copper edges was visible. I could see 10 stars in Cygnus and now also 3 in Lyra.|
U1 + 45m
U2 – 15m
|80 percent/total. Copper color much more visible along dark disk limbs.|
U1 + 46m
U2 – 14m
|I could now see the Pleiades in direct vision|
U1 + 48m
U2 – 12m
|The shadows cast by the moon on the ground were almost gone.|
U1 + 51m
U2 – 10m
|95 percent totality. The Moon’s dark disk was hauntingly beautiful, with deep, rich copper colored edges and a darker reddish-brown in the center.|
U1 + 54
U2 – 5m
|The Moon was just a sliver. 11-12 stars visible in Cygus, 5 stars visible in Lyra Pleiades were getting brighter.|
U1 + 55
U2 – 4m
|The moon was nearly gone, just a thin bright crescent on the southwest limb. No visible shadows were being cast at this point.|
U2 + 2m
|Totality. Aquarius became visible around the moon, which was a coppery-red and brightest at South and West limbs, darker at NE limb and darkest in the center. I note that there is a time discrepancy between when I marked totality and the NASA table above. I believe that this is due to (1) it taking me a long time to enter that in the dark and (2) a possible delay in the tweet getting to twitter and (3) my uncertainty as far as the exact point of totality|
U2 + 5m
|The moon was strikingly beautiful in totality. I don’t think I’ve ever seen a total lunar eclipse before that struck me as this one did. The color was a rich, deep coppery-red, not ‘blood’ like others have described it. It hung there, like Aquarius’s beach ball (Luna Aquarii?). I turned to my left and looked at Mars blazing away next to Aldebaran, looking like a pair of red eyes, the right one winking. The Pleiades were sparkling away above the pair. I stood out under the sky for a while longer, before deciding that I should go in and try to catch another hour or two of sleep.|
U2 + 8m
|Note to self; next time bring your flashlight and remember where the rosebush is!|
U3 + 57m
U4 – 3m
|I woke up in time to see the tail end of the eclipse. The moon was moving out of the umbra, and I watched it until the last shadow of the Umbra was gone.|