Solar days are of unequal length. To obviate this diffeulty, astronomers imagine 'a. "mean num," whose centre intricacies of witch a Greek cho!
an infant's puzzle." Professor Hudson Williams, of the University College of North Wales, travels. around equator of the an address on the teach:
fon. When this' mean sun passes Neaveng with," perfectly uniform 19" ling of Greet at the faceting of the! rrevidiag of any place, it "ly mean Cfanical Aseeaton at Bangv.
Text read from the printed page and cleaned; old type leaves the occasional error.