A Manual of Experiments in Elementary Science: Teacher's Edition (1918)
Curtis, Francis D. · Charles E. Merrill Company · leaf 30
6 EXPERIMENTS IN ELEMENTARY SCIENCE … Fig. 2 (T). I around the earth.) If journeying east, the traveler must set his calendar back a day, because he has gone to meet the sun, and in a complete circumnavigation has had, therefore, two sunrises, while those who remained at home have had but one. 5. May 1. April 29. 6. 12 : 01 p.m.…
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