A Clair Obscur Effect

As the Moon rises above the SE horizon @ approx 16.00 Hrs BST 15.00 hrs UTC 

until it sets below the SW horizon @ approx 23.30 hrs BST 22.30 hrs UTC

on Saturday the 2nd of August

a Clair Obscur Effect known as Plato’s Hook will be visible along the Moon’s terminator

this effect would be best viewed @22.30 hrs BST 21.30 hrs UTC

if you plan to observe / image this event remember to dress for the conditions