Astronography, or, Astronomical geography, with the use of globes : arranged either for simultaneous reading and study in classes, or for study in the common method (1854)
d you perceive that the fig-ure is divided into eight trian-gles, meeting in the centre.These 8 triangles are equal inarea each to each. Those ad-jacent to s b the shorter axis,are shorter triangles thanthose adjacent to sa the longeraxis; but these are as muchbroader as to make up thedeficiency.… … 7. What are we here to consider ? What is said of the mo-tion of the Earth in her orbit? What is universally true of themoving heavenly bodies ? By whom was this law discovered ?—8. How far does your author attempt an exposition of Keplerslaw ? Draw the figure, and explain it as far as it may be…
Astronomy
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