23 August 2008
Not long ago I said something about starting to live more deliberately.
Ganymede surprised me tonight. I spent quite some time looking at Jupiter, trying out the filter set I bought last weekend. The day I bought the set was beautifully clear. By that night, the clouds had rolled in, erasing any chance of actually trying the filters out. And tonight was the first night since on which the sky was clear enough to observe.
And so I set up in the backyard, moving the sand table and the little plastic slide out of the way to make room for the scope. Old Jove wasn't hard to find - it's pretty much the brightest thing in the southern sky right now. But looking through the eyepiece, I immediately noticed that I could only see three specks of light on a line running east-west through the planet, instead of four. One of the moons was missing. I thought nothing of it, as the moons weren't my quarry.
The detail in Jupiter was better with the filters. The cloud bands popped out to varying degrees, depending on which colour I used. I switched back and forth for some time, staring at the planet at length, trying to discern any detail I had missed. The southern belt seemed thicker than the northern. The southern pole of the planet looked darker than the rest of it.
I doubted myself a little when I thought I saw a speck of light to the east of the planet (all three visible moons were on the line to the west). I refocused and looked again, and sure enough, there was a very faint point that I didn't remember noticing before.
I was to find out later that this was Ganymede, with its seven-day orbit around Jupiter and its liquid iron core. It began faint, as it moved from umbra into penumbra, slowly exposing itself to more and more of the sun, and in mere minutes hung in the broad daylight of space.
It was the rate at which this occurred that struck me. I had seen it once before, nearly two months ago, when Martin and I watched another of Jupiter's moons disappear into its massive shadow. And now that I think of it, that might have also been Ganymede.
And it may yet be a little too early to tell, but the sense is growing in me that I just might have escaped the umbra of "the shadow of things undone". The rate of change is unexpected and perhaps even alarming. But welcome. Like a little bit of daylight on my face. Not yet the whole blazing sun. In fact, for now just a sliver, maybe. But a widening one, made of intentions carried to fruition with an uncharacteristic regularity.
For a while, I think I can handle the penumbra.
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