[14]. "Newcomb's Astronomy," p. 476.
[15]. "Newcomb's Astronomy," p. 477.
[16]. Johann Heinrich Madler, born 1794, died 1874.
[17]. "Newcomb's Astronomy," p. 466.
[18]. "Newcomb's Astronomy," p. 466-7.
[19]. "Newcomb's Astronomy," p. 466.
[20]. And light travels at the rate of 198,000 miles per second.
[21]. "Draper's Intellectual Development of Europe," Vol. ii., p. 292-3.
[22]. Intellectual Development of Europe, Vol. II., p. 299.
[23]. Newcomb's Astronomy, p. 305.