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What does HA stand for?

HA stands for Hour Angle

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com [ILLUSTRATION OMITTED] Heritage Watch Manufactory: The Firmamentum A unique measurement and navigation instrument Technical specifications: * Independent manufacture; calibre 870 * Hand bevelled movement plates * 3 patents pending * Hour angle instrument for the observation of heavenly bodies by means of 13 hands with two additional displays * Polished/satinised Eric Giroud steel case; domed sapphire glass * German silver plate and white gold applications designed by Eric Giroud * Leather/alligator brace
The direct radiation is empirical established depending on the extraterrestrial radiation, the medium solar constant, the day number during a year, the distortion factor, the solar altitude angle, the solar declination, the latitude angle, the solar hour angle, and the local solar time.