Abstract
The solar eclipse of June 30, 1954, was not visible at Palomar Mountain ; by sunrise the penumbra of the moon's shadow had moved well across the country far to the northeast of southern California. At the time of the beginning of morning twilight at Palomar, however, the sun, rising at a point in the north central United States and contributing to Palomares twilight, was still approximately three-quarters eclipsed. It was expected that the sun, so eclipsed, would produce a darker than usual dawn at Palomar. To determine this effect quantitatively, the brightness of the sky, both at the zenith and at the celestial pole, was measured at brief intervals during the early period of morning twilight with a nightsky meter, mounted just east of the dome housing the 48-inch schmidt telescope with which the authors were photographing fields for the National Geographic Society-Palomar Observatory Sky Survey.
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