“So I will. No, it’s no use.”
“Why not?”
“I don’t know when to begin.”
“When to begin?”
“Well the sundial must have a start. You must begin your hours, don’t you see.”
“I see; you don’t know what hour to put to the shadow.”
“That’s it.”
“But can’t you find out? Isn’t the sun always south at noon?”
“But which is quite south?”
“Just exactly proper south?”