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Questions tagged [time]

How passage of time impacts space exploration activities.

6
votes
1answer
168 views

What time of events is given for probes a long way away from Earth?

Philae is to land on 67P/Churyumov-Gerasimenko today at 17:02 CET. The comet is currently 3.409AU away from Earth. That means signals from the lander take a little over 28 minutes to reach Earth. Does ...
11
votes
4answers
2k views

Has an interplanetary date/time system been established yet?

Obviously, with no humans living permanently off-planet yet, Earth-style dates and times are the most common system is use, and reasonably so. And it helps that Mars's day is almost the same length ...
32
votes
5answers
37k views

How does GPS receiver synchronize time with GPS satellites?

GPS satellites transmit time values regularly, but if we put in consideration the time delay between the satellite and the receiver, the time value received wouldn't be accurate insofar as I know GPS ...
0
votes
1answer
530 views

how much does time slow down with gravitational time dilation, on a black hole with these graph trajectories.? [closed]

How much does time slow down with gravitational time dilation, on a black hole with these graph trajectories.? If you watch a journey into a black hole on Youtube before reading this question, it ...
14
votes
3answers
425 views

How would time measurement be done over great distances?

Already on earth the time is a bit of a problem with the time-zones. It is not that big a problem though, since we all "travel" at (nearly) the same speed. Not so in space. With the time dilatation (...
8
votes
3answers
2k views

How would we communicate over light years?

Anyone who has been in an email conversation where the chain split into different threads, or has been in chat where they receive two diverging comments requiring a response before a reply to the ...
11
votes
3answers
691 views

Day versus night launches

Most launches that I've seen have occurred during the day. But I've also seen a couple of missions that have been launched at night. Are there any specific advantages or disadvantages to a day launch ...
16
votes
2answers
2k views

Do the Voyager space probes perform time synchronization regularly?

According to JPL: http://voyager.jpl.nasa.gov/mission/weekly-reports/ Voyager 1 travels at a velocity relative to the Sun of 19.03 km/s (or 0.000063478 c, or a time difference of ~ 0.0005 seconds per ...
27
votes
4answers
16k views

What time zone is used on ISS to define a day?

What time zone is used on ISS to define when a day starts? Is it the same as mission control? Do Russian cosmonauts use a different time zone respect to European and American astronauts?