NASA will attempt to fuel its Artemis II rocket again tomorrow after hydrogen leaks derailed the first wet dress rehearsal and delayed what is scheduled to be a historic crewed flight around the moon.

O'clock is a way of telling the exact hour on a clock. We say "o'clock" when the minute hand (the long hand) points to the number 12 on the clock. When the minute hand points straight up to 12, it ...

When the minute hand of a clock (the longer hand) has travelled from 12 halfway around the circle to point at 6 this is half past the hour. The hour hand (the shorter hand) also moves. When it is half ...