"Dave Liquorice" wrote

An Iridium Flare is a rotating satellite with large solar panels.

I didn't think Iridium sats rotated well not like some do but
maintained a fixed attitude relative to the ground and it was this
that enabled the prediction of the "flares" to be very accurate.

The DO rotate - about once every 1 hr 42 mins (= one orbit round earth)

Didn't I enjoy being such a pedant!

Jack