"It's going to be warmer to-day."

"I think not," said Frank. "When I went to the barn it seemed quite
cool."

"What do you think, Susie?" asked Uncle Robert.

"It was cool under the trees when I went to the spring for a pitcher of
water," said Susie, "but it seemed rather warm in the sun. I think it is
a lovely morning."

"What makes it warm?" asked Uncle Robert.

"Why, the sun," replied Donald, looking rather surprised at such a
question.

"But does the sun make it warm in the winter?" asked Uncle Robert.

"The sun is nearer the earth in spring and summer," said Frank
confidently.

"You are mistaken," said Uncle Robert. "The sun is farther from us in
summer than it is in winter."

"But it's almost over our heads in summer," said Frank. "How can it be
farther away?"

"The story of the warmth that the sun gives us is not told by
distance," said Uncle Robert, "but by the length of the shadows at noon."