Astro-Calendar: April / Possible GPS Date & Time Problem April 6
Blog: GPS
"Week Number Roll-Over Event"
occurs every 19.7 years.
MORE INFO - CLICK ON LINK ---
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Link >>>
https://spacewatchtower.blogspot.com/2019/04/astro-calendar-april-possible-gps-date.html
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Calendar: Link >>>
http://buhlplanetarium4.tripod.com/astrocalendar/2019.html#apr
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