# Questions tagged [time]

How passage of time impacts space exploration activities.

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### What time format does Voyager twitter use?

Lately I saw this strange date format in a Voyager 2 tweet: Sister ship @NASAVoyager is 21 hrs 19 mins 00 secs of light-travel time from Earth (2021:247:120000:1L) Of course I understood that first ...
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### How did NASA refer to dates and times of a mission in the 1970s?

Back in the 1970s, how did NASA describe when an event happened during a mission? For example, when Mariner 10 did its fly-by of Venus, how did the Mariner team refer to that moment in time? Did ...
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### How old is the use of "L minus" to denote the number of days before launch?

In the SpaceX Inspiration4 Launch broadcast at about T-01:31:05 (91 minutes before launch) the term "L minus five" is used. While "T-minus" is a ...
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### How to calculate Local Time of Ascending Node (LTAN)

I have a time series of satellite position, $\mathbf{r}(t_i) = (r_i,\theta_i,\phi_i)$ representing geocentric radius, colatitude and longtiude at universal times $t_i$. I want to compute the Local ...
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