Spacetime

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Space

See Physics#Cosmology, Mapping

to merge with Physics?


Stars Not Where They Seemed or Were Calculated to be, but Nobody Need Worry.

Earth

  • SATFLARE - In this page you can track in real time all the satellites orbiting the Earth, with both 2D and 3D interactive representations, predict their passes, view their trajectory among stars on an interactive sky chart, predict satellite flares and transits (across the Sun and the Moon), find out the best location to see these events on a detailed Google map. You can also follow satellite re-entries and other special events, join the observer community, post messages and share your comments and observations. Currently in our database we have more than 9000 observation reports!

Moon

Mars

Software

Time

See also Organising#Time management

Time zones

Calendar

For accounting: a 5 week month = 5 weeks including a Monday

Clocks


to sort

1h = 3600s 1d = 86400s 1w = 604800s 28d = 2419200s

http://jtnimoy.net/workviewer.php?q=178




Unix epoch

while true; do echo "$(date +%s)" | figlet ; sleep 0.99 ; done
date -u -d @1400000000
  gives datetime in UTC

NTP

Linux