Angles in the Sky?

Details Angles in the Sky? Angles in the Sky?

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005stard..33e..16b&link_type=abstract

StarDate magazine, vol. 33, p. 16-19

Astronomy and Astrophysics

Astronomy

Telescope, History And Philosophy Of Astronomy, Reference Systems

Scientific paper

Tycho Brahe lived and worked in the late 1500s before the telescope was invented. He made highly accurate observations of the positions of planets, stars, and comets using large angle-measuring devices of his own design. You can use his techniques to observe the sky as well. For example, the degree, a common unit of measurement in astronomy, can be measured by holding your fist at arm's length up to the sky. Open your fist and observe the distance across the sky covered by the width of your pinky fingernail. That is, roughly, a degree! After some practice, and knowing that one degree equals four minutes, you can measure elapsed time by measuring the angle of the distance that the Moon appears to have moved and multiplying that number by four. You can also figure distances and sizes of things. These are not precise measurements, but rough estimates that can give you a "close-enough" answer.

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