Review of reviews and world's work . GRADUATED ARC TELESCOPE ARMTHE ANGLE OF THISARM GIVES-THE SUNSALTITUDE V^HAT THE SEXTANT SHOWS. LEADIhJG ARTICLES OF THE MONTH. 607. OBSERVING THE SUN AT THE POLE. mination of the sun; the other, known ascircum-meridian observations, and based onmethodical and minute observations of thestars, including the Pole-star. But at theNorth Pole, from March 21 to September22, the sun is above the horizon, and the starsare therefore probably invisible, at least tothe naked eye. Dr. Cook has said that hereached the end of his journey on April 21,igo8. We may accordin
Review of reviews and world's work . GRADUATED ARC TELESCOPE ARMTHE ANGLE OF THISARM GIVES-THE SUNSALTITUDE V^HAT THE SEXTANT SHOWS. LEADIhJG ARTICLES OF THE MONTH. 607. OBSERVING THE SUN AT THE POLE. mination of the sun; the other, known ascircum-meridian observations, and based onmethodical and minute observations of thestars, including the Pole-star. But at theNorth Pole, from March 21 to September22, the sun is above the horizon, and the starsare therefore probably invisible, at least tothe naked eye. Dr. Cook has said that hereached the end of his journey on April 21,igo8. We may accordingly assume,—bear-ing in mind the uncertainty as to the visibilityor invisibility of the stars,—that he reliedsolely on observations of the sun. This wasmoreover the simplest operation, since a sin-gle observation, followed by elementary cal-culations, would give the desired results. Each day at noon the sun attains the high-est point of its apparent course toward space,its culmination; and at the approach ofthis hour the explorer prepares for his obser-vation. The Illustration writer gives a de-tailed description of the process of taking anobservation of the
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