Archives for the 'Earth' Category
Earth Day
Published on 22 Apr 2009 at 1:57 pm.
3 Comments.
Filed under Earth, politics.
April 22 is Earth Day. The first Earth Day was April 22, 1970. I was in school at the time. Earth Day had been announced nearly a year earlier. There were plans laid for teaching about ecology, protection of the environment, energy conservation, etc. We had an aluminum recycling […]
Two More Co-Orbitals of Earth
Published on 27 Jan 2009 at 4:25 pm.
14 Comments.
Filed under Earth, asteroids, astronomy.
In my last post, I wrote about the asteroid 2009 BD, which has an orbit very nearly that of Earth’s. But, it is not Earth’s only orbital companion. I know of more than a half dozen asteroids whose orbits would be considered co-orbital with Earth. The two that I want to talk […]
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Earth Day 2008
Published on 22 Apr 2008 at 8:54 pm.
2 Comments.
Filed under Earth, politics.
April 22, 1970, I went to school as on any other day. Only that day, many of the lessons were on Earth and the environment. That was the first Earth Day. I remember that we had an aluminum recycling contest going on in the school that had been going on since Christmas […]
Earth and Luna
Published on 12 Mar 2008 at 7:02 pm.
2 Comments.
Filed under Earth, moon.
NASA’s Mars Reconnaissance Orbiter (MRO) left Earth August 12, 2005. It arrived at Mars about two years ago, March 10, 2006, joining a flotilla of other spacecraft studying the red planet. Last October, the MRO turned its HiRISE camera towards home, capturing the image above. The HiRISE camera (High Resolution Imaging Science […]
Big tides
Published on 24 Nov 2007 at 5:53 pm.
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Filed under Earth, moon.
Today is Full Moon. This Full Moon also falls on the same day that the Moon reaches perigee (the closest point in its elliptical orbit to the Earth). That means high tides. I’ve blogged about tides twice before: here and here. You can read those postings to find more about […]
Aphelion
Published on 6 Jul 2007 at 1:39 pm.
2 Comments.
Filed under Earth, astronomy, planets.
Earth is currently at aphelion (or will be just a few hours after I write this). Like all the planets, Earth’s orbit is somewhat elliptical. Johannes Kepler studied planetary motion in the early 17th Century. His first law of planetary motion, based upon his analysis of Tycho Brahe’s observations, was that planets […]
AIMing at Earth
Published on 26 Apr 2007 at 1:10 pm.
1 Comment.
Filed under Earth, atmosphere.
Well, that is an ominous sounding title. No, I don’t mean that alien space battlecruisers are aiming destructor beams at Earth. Rather, I am refering to yesterday’s launch of the Aeronomy of Ice in the Mesosphere (AIM) spacecraft aboard a Pegasus XL rocket.
Almost all of Earth’s clouds form in the troposphere, the lowest […]
