Monday, April 1, 2019

Astro-Calendar: April / Possible GPS Date & Time Problem April 6


Artist's conception of GPS Block II-F satellite in Earth orbit.
(Image Sources: NASA, Wikipedia.org, By NASA - http://www.navcen.uscg.gov/ftp/gps/ggeninfo/gps-iif.tif[dead link] (Wayback Machine), Public Domain, https://commons.wikimedia.org/w/index.php?curid=564265)
 April 6 will mark a critical "Week Number Roll-Over Event" which could affect the date and time functions on some GPS receivers. Since GPS began in 1980, this will only be the second time this event has happened, which occurs about once every 19.7 years.
More info: Link >>> https://www.gps-repeaters.com/blog/gps-week-number-rollover-april-6th-2019/

Astronomical Calendar for 2019 April ---
Link >>> http://buhlplanetarium4.tripod.com/astrocalendar/2019.html#apr

 Related Blog Post ---

"Astro-Calendar: March / 1st SpaceX Crew Dragon Launch March 2."

2019 March. 1.

Link >>> https://spacewatchtower.blogspot.com/2019/03/astro-calendar-march-1st-crew-dragon.html


Source: Friends of the Zeiss.
              Monday, 2019 April 1.

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gaw

Glenn A. Walsh, Informal Science Educator & Communicator:
http://buhlplanetarium2.tripod.com/weblog/spacewatchtower/gaw/ >
Electronic Mail: < gawalsh@planetarium.cc >
Project Director, Friends of the Zeiss: < http://buhlplanetarium.tripod.com/fotz/ >
SpaceWatchtower Editor / Author: < http://spacewatchtower.blogspot.com/ >
Formerly Astronomical Observatory Coordinator & Planetarium Lecturer, original Buhl Planetarium & Institute of Popular Science (a.k.a. Buhl Science Center), Pittsburgh's science & technology museum from 1939 to 1991.
Formerly Trustee of the Andrew Carnegie Free Library and Music Hall, Pittsburgh suburb of Carnegie, Pennsylvania.
Author of History Web Sites on the Internet --
* Buhl Planetarium, Pittsburgh:
  < http://www.planetarium.cc >
* Adler Planetarium, Chicago:
  < http://adlerplanetarium.tripod.com >
* Astronomer, Educator, Optician John A. Brashear:
  < http://johnbrashear.tripod.com >
* Andrew Carnegie & Carnegie Libraries:
  < http://www.andrewcarnegie.cc >

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