Solar Ephemerides

Longines "Solar Ephemerides" Wristwatch, reference 5235. Shows the solar time, sunrise, sunset, day and date and the sun's declination at north and south of Ecuador. The watch is equipped with L40 Longines caliber, automatic with a power reserve of 44 hours.
The dial is white porcelain, sunrise and functions of the sun are at 12 o'clock. The declination of the sun is at 6. Circa 1989.