What is a time vector?

I downloaded a library for calculating the moon's position and one of the inputs is a 'vector of Julian days in TDT time scale.' Does anyone know the format of this input? Thanks

[Adam]

Since it is 3rd party code it could be anything. If it is good 3rd party code it will either include a help section with an example or something like a

validateattributes

line which makes it clear what type of input is expected. Otherwise you'd have to search through the code for where the input is used and try to work out from the context what it is expected to be, which is never fun.

Answer 1

[James Tursa]

See this article for a discussion of TDT and its relationship to TAI:

https://en.wikipedia.org/wiki/Terrestrial_Time

And this article which further relates TAI to UTC:

https://en.wikipedia.org/wiki/International_Atomic_Time