Category Archives: Astronomy

Shadow Dance of the Eclipses – Handling Light (updated)

Early part of 21 August 2017 solar eclipse

Photo of a projection onto a screen through a telescope of the early part of the 21 Aug 2017 eclipse. Two groups of sunspots are visible—a cluster of three near the center, and a cluster of two near the bottom edge.

Eclipses come in two varieties. The first kind occurs because our moon is the solar system’s odd duck.

For example, it travels a special orbit. Like ballroom choreography that looks simple until close inspection, the Moon only appears to orbit the Earth. In fact, it orbits the Sun. The Earth, 80 times heaver than the Moon, moves steadily on its course about the Sun. But the Moon weaves rhythmically either side of the Earth’s orbit, first outside farther from the Sun, then in front of the Earth, then inside closer to the Sun, and then trailing the Earth. The two dancers interlock gravity arms and sway in 29-day rhythm. read more ...

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Coming to the Wild Point of View

Amateur astronomers standby telescopes waiting for dark

Observers set up equipment in the last light of day, then wait for dark

Cool desert evening. Clear sky. Sun crossed the horizon a few minutes ago as my friend, Bob, and I head towards the Snake River south of Boise, Idaho. The Owyhee mountains stretch across the horizon before us. Around us flat rolling grassland slowly descends to the river, but just a mile short we arrive at Dedication Point—a ubiquitous dessert historical site complete with parking area, restroom, intense quiet, unobstructed view in every direction, and, most importantly, the promise of dark sky. read more ...

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