US 12,436,505 B2
Electronic watch for space and/or surface exploration
Jorge Luis Vago, Noordwijk (NL); and Poulakis Pantelis, Noordwijk (NL)
Assigned to EUROPEAN SPACE AGENCY (ESA), Noordwijk (NL)
Appl. No. 17/920,568
Filed by EUROPEAN SPACE AGENCY (ESA), Noordwijk (NL)
PCT Filed Apr. 22, 2020, PCT No. PCT/EP2020/061140
§ 371(c)(1), (2) Date Oct. 21, 2022,
PCT Pub. No. WO2021/213640, PCT Pub. Date Oct. 28, 2021.
Prior Publication US 2023/0152752 A1, May 18, 2023
Int. Cl. G04G 9/00 (2006.01)
CPC G04G 9/0076 (2013.01) 15 Claims
OG exemplary drawing
 
1. An electronic watch, comprising:
a time displaying means for displaying time, wherein the time displaying means is electronically controllable to display a determined time;
a processor subsystem configured to electronically communicate with the time displaying means and to:
maintain a coordinated planetary time (UTC, MTC) which is defined for a prime meridian of a terrestrial planet;
obtain longitudinal data, the longitudinal data representing a longitude of interest on the terrestrial planet which is different from the prime meridian;
determine a local true solar time, LTST, at the longitude of interest as a function of the coordinated planetary time and using an equation of time which accounts for orbital eccentricity and rotational axis tilt of the terrestrial planet; and
control the time displaying means to display the LTST.