Windsor Castle witnesses watch a bright object cross the sky

At about 21:45, four observers on a Windsor Castle terrace reportedly saw a luminous, initially oval cloud-like object. The article says it became a brilliant globe, appeared stationary, was dark blue at first, then brightened and moved east. It changed direction, moved parallel to the horizon and disappeared in the southeast, illuminating the surrounding landscape. It says the observation was recorded in Philosophical Transactions and associates the illustration with Thomas Sand and his brother Paul. Those names and the description are retained as printed; the page does not provide the original journal reference or establish the physical nature of the appearance.