# (8b)   Parallax

An introduction to "pre-trigonometry," the estimate of the distance to a far-away point C to which the lines of sight from the two ends (A,B) of a "baseline" AB make a small angle α. It is also assumed that AB is perpendicular to the line from the baseline to C.

Then we can regard the (straight) "baseline" AB as approximately equal to an arc of a circle centered at C, and knowing that 360° correspond to the full circle 2πR, use this to calculate the distance R = AC

Part of a high school course on astronomy, Newtonian mechanics and spaceflight
by David P. Stern

 This lesson plan supplements: "Parallax," section #8b: on disk Sparalax.htm, on the web           http://www.phy6.org/stargaze/Sparalax.htm "From Stargazers to Starships" home page and index: on disk Sintro.htm, on the web           http://www.phy6.org/stargaze/Sintro.htm

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Author and Curator:   Dr. David P. Stern
Mail to Dr.Stern:   audavstern("at" symbol)erols.com .

Last updated: 12.17.2001