by matsuyuki
Question by : How high up is the umbra of an annular solar eclipse?
From Earth, an annular solar eclipse appears as a solar ring. How high would you have to go up for it to appear as a total eclipse? In other words, how high is the point that that connects the umbra to the antumbra? Let's use the eclipse of May 10, 1994 as an example.
Best answer:
Answer by bikenbeer2000Since the Sun and Moon both appear about 0.5ยบ in diameter in the sky, this is the angle of taper of the Moon's shadow, i.e. about 1/100th of a radian. So for a shadow path width of 100 km on the surface of the Earth, the apex of the cone of the shadow will be about 10,000km above the Earth's surface.
For the 10th May 1994 eclipse, a list of the widths of the annular path is provided here: http://eclipse.gsfc.nasa.gov/SEpath/SEpath1951/SE1994May10Apath.html
Multiply all the widths by 100 to obtain an approximate answer.
Add your own answer in the comments!
Saturday, August 18, 2012
How high up is the umbra of an annular solar eclipse?
What does my dream mean? An airplane crashed, lightning, earthquake..?
Question by : What does my dream mean? An airplane crashed, lightning, earthquake..?
There were two parts
First part: I was standing in my balcony and I saw a plane falling from the sky. It was going to hit my house but it suddenly turned and hit across the street, two houses down. There were no survivers and I even saw it on the news.
Second part: The next day I had 3 people over (they are aquaintences but for some reason we were friends in my dream). We were talking in my dining room. I was talking about the plane crash (showed them a video on youtube of the disaster). Suddenly. lightning struck my house and there was an earthquake. We were running out the house, and I realized I left my dog inside. I woke up.
It felt so scary and real, I had to ask myself if a plane really crashed.
I'm starting University very soon, and I'm the first person in my family who's actually going to college. I worry about my future a lot, this economys not really helping my worries.
Best answer:
Answer by L8NightYou are on your balcony, which means you are searching for prestige and better social status. The plane crash indicates that you have set excessive, idealistic goals for yourself. You may lack confidence and have self-doubt about your goals. Disaster represents your personal anxieties and fears of change. You are afraid of not knowing what is in store for you in the future. The house being struck by lightning symbolizes irreversible changes occurring in your life.
Give your answer to this question below!
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