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Category Archives: precession
I think one of the most interesting topics in Chapter 2 of the Astronomy textbook is about the concept of precession, or the gradual change in the rotational axis of Earth. The direction of Earth’s axis rotates on a 26,000 year cycle. That may mean next to nothing to us in our lifespan, but precession will gradually […] Continue reading → Continue reading
The Earth is like the top from Inception. As it spins around at very high speeds it wobbles or “precesses” back and forth as the force of gravity from the Moon and Sun tug it from different directions, but it will never fall over. This movement, although much slower and less noticeable than the Earth’s […] Continue reading → Continue reading
Axial precession is the gradual wobble that alters the orientation of Earth’s axis in space. Historically, discovery of this phenomenon was attributed to Greek astronomer Hipparchus. The axis traces out the path of a cone over a 26,000 year cycle. When I first read about this concept, I imagined Earth becoming like Westeros and experiencing […] Continue reading → Continue reading
I’m a very visual learner, so when trying to understand the phenomenon of axial precession, I sought out a visual representation of what exactly is going on. This video perfectly explains (for this level class) the causes and implications of axial precession. It leaves us with an advanced understanding of how axial precession affects our […] Continue reading → Continue reading
The Zodiac was created about 2,000 years ago as a way to track time. Each month, the sun appears to pass through 1 of 12 constellations that are each tied to a sign (In 1930, the International Astronomical Union, actually defined 13 constellations that the Sun passes through, but one does not have a sign). […] Continue reading → Continue reading