# Why will the RP-1 loading for SpaceX's Iridium-1 mission begin at T-00:70:00 as opposed to T-01:10:00?

Why will the RP-1 loading for SpaceX's Iridium-1 mission begin at T -00:70:00 - wouldn't it usually be written as T -01:10:00?

$\hspace{6cm}$

Screen shots (above and below) from: http://www.spacex.com/sites/spacex/files/spacex_iridium1_press_kit.pdf

$\hspace{6cm}$

• Maybe just a clerical error without any significance – oefe Jan 14 '17 at 11:38

It absolutely should be -01:10:00. My guess is that someone was counting backwards from T = 0, and didn't think long enough about what they were typing. Press kits are usually put together by PR or media relations people, who at SpaceX are probably on just as tight deadlines as the engineers. Mistakes will be made.