Category: Space

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I saw the planet Venus four times on my walk to and from lunch today! Yes, in broad daylight!

Someone on Slashdot mentioned it was possible last week. I took it seriously because back in high school, I used to watch Venus fade into the brightening sky on winter mornings. Often I could still find it once I arrived at school, since I knew exactly where to look.

I tried unsuccessfully a couple of times over the past week, but today I had a ~20-minute walk mostly facing southward, so I thought I’d give it a shot.

I used the Moon as a guide, trying to guess the distance based on how far apart they were last night. As I passed through a building’s shadow, I spotted a stationary white dot in the right area, a bit more than a hand span away from the crescent Moon in the direction of the sun, barely visible next to some wispy clouds. I couldn’t find any sign of a con trail, and it didn’t move, so it clearly wasn’t an airplane, but I was able to look away and back and still see it. Continue reading →

Current Mood: 🙂excited

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The Moon and Venus behind a tree (Nov. 5, 2005 @ 5:09pm PST)

This view of the Moon and Venus was taken from our apartment balcony earlier this evening.

I also took a picture yesterday, from the top of a parking structure near John Wayne Airport (we went to a show at UCI later that evening.) You can see the red trail an airplane left as it crossed the frame:

The Moon and Venus above a cityscape (Nov. 4, 2005 @ 6:01pm PST)

Having seen that pairing last night, I knew I had to be ready to catch it today! I figured the Moon would be a lot closer, but I hadn’t expected it to actually pass Venus tonight. It really gives you an idea of how far the Moon moves in 24 hours. (or, in this case, roughly 23 hours, since yesterday’s picture was taken at 6:00 and today’s was taken at 5:10).

To be honest, I wasn’t actually certain it was Venus. It was my first thought, because of the brightness and the color, but I kept thinking it was too far from the sun. I kept trying to convince myself it was Jupiter or maybe Saturn (it wasn’t red enough for Mars, and besides, I’d seen Mars on the other side of the sky the night before). When I looked it up and realized it was Venus, I started remembering my days in high school when I would walk to school for a 7:00am “zero period” class. In winter it would sometimes be just dark enough when I left to see the planets and the brightest stars. I would keep my eye on Venus as the sky brightened, trying to see how late I could still see it by knowing exactly where to look.

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About a month ago I posted about noticing the Belt of Venus—the red band that circles the entire horizon just after sunset—and the Earth’s shadow on the sky. I snapped this picture on the drive home this evening. This is looking east, away from the setting sun.

Looking east toward Saddleback at sunset.

If you look at the right edge of the picture, behind the silhouette of the tree, you can just see the red band fading into the dark gray of the Earth’s shadow.

(And to think, I almost brought the good camera with me this morning… Update: It turns out that I did bring it, and just didn’t realize it was there. Oh, well.)

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A quick question for people who discount the idea that global warming could be caused, in part, by human activities on the basis that we can’t possibly impact the climate as much as natural events and cycles affect it.

Do you also discount the well-documented depletion of the ozone layer by interaction with CFCs and similar chemicals? That seems to be a major environmental impact, and one that clearly has an anthropogenic component.

Nearly two decades after we cut back on CFC use, it looks like the ozone layer is finally starting to recover—or at least it’s stopped shrinking. Of course, it’ll take time. The whole reason we started using CFCs is that they didn’t seem to react with anything, so they’ll stay in the atmosphere for decades. UCI’s Sherwood Roland (who won a Nobel Prize for research on this topic) is quoted as saying, “This problem was a long time in the making, and because of the persistence of these chlorine compounds, there is no short-term fix.”