Mike Murphy wrote in
:

It's worth noting that the next programme is on on Sat 5th (12:45 to
13:10 BST), repeated on Monday the 7th (00:50 to 1:15 BST), a reversal
of the usual pattern so that they both go out before the transit on
the 8th.
- Mike

Just tried to set this on Sky+ and it isn't in the schedule for that time
on the Saturday.

Digiguide is showing it as the following:

The Sky at Night (Scientific Documentary)
Starting: 23:55 on Sunday 6th June. Duration: 25 minutes
Showing on BBC 1.

But I won't be able to confirm that until Monday as it only does 7 days in
advance.