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Using the SIMBAD database for Alnitak, Saiph, and Sirius -- i.e.:

Alnitak: FK5 coord. (J2000): RA = 05 40 45.527 DEC = -01 56 33.26; Saiph; FK5 coord. (J2000): RA = 05 47 45.389 DEC = -09 40 10.58; Sirius; FK5 coord. (J2000): RA = 06 45 08.917 DEC = -16 42 58.02;

What is the trigonometric relationship in degrees -- length of sides and inclusive angles to four decimal places -- between these three stars when they are used to form a triangular aterism?

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I guess, to measure the length of sides, you should also give the distance. –  Py-ser May 9 at 1:03
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Question is not clear. Do you want spherical triangle formulas? Or real space ones? –  Envite May 9 at 6:01

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