Recent content by bethpage89

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    Graduate Sunrise and sunset correction for astronomical and geographical factors

    A formula for angular height (h) of a celestial body, e.g. Sun, is: Sin h = (sin lat)(sin dec) + (cos lat)(cos dec)(cos hour angle). Disregarding refraction, the Sun's height when its upper limb is at the horizon is about -[16' + 1.06'√(observer elevation in feet). For elevations at...
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    Undergrad How Do You Determine Visible Right Ascension and Declination Coordinates?

    RA and Declination Better than the Weems star finder, but more expensive, is a celestial globe which can be adjusted to show what stars might be available. I see them on eBay often, by searching under "star globe," "celestial globe," or "Russian globe." Most Russian ones label stars and...
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    Undergrad How Do You Determine Visible Right Ascension and Declination Coordinates?

    Get a Weems star finder for a few dollars on eBay.
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    High School Is self-teaching calculus a viable option?

    "Quick Calculus" is a good little book, and is easy to find on eBay, bibliofind.com, and abebooks.com