Address of William M Pierson Retiring President of the Society At the Fourth
Address of William M Pierson Retiring President of the Society At the Fourth
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Compare them frequently, and record any apparent changes.
And here let me say that the climate of California is peculiarly adapted to observational and photographic Astronomy. In the great valleys the nights are almost uniformly clear from May to November, and the winter and spring evenings, when not clouded are exceptionally fine. I have no data as to the num- ber of observing nights in those localities, but in San I'rancisco I have kept a record since October, 1888. Even in that place, so muc...h abused for its summer fogs and winter rains, there is a considerable majority of the nights free from fogs and clouds. Out of 1253 nights, I have a record of 11 82; of these, 645 were unobscured by cloud or fog, and 537 obscured. Many of them were first-class observing nights, in which the highest power of the telescope could be used with advantage, and the remainder of the 645 were more or less satisfactory with lower powers.
But you may have neither optical or photographic apparatus, nor the opportunity or taste for observation.
What to read after Address of William M Pierson Retiring President of the Society At the Fourth?
You can find similar books in the "Read Also" column, or choose other free books by William M Pierson to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Compare them frequently, and record any apparent changes.
And here let me say that the climate of California is peculiarly adapted to observational and photographic Astronomy. In the great valleys the nights are almost uniformly clear from May to November, and the winter and spring evenings, when not clouded are exceptionally fine. I have no data as to the num- ber of observing nights in those localities, but in San I'rancisco I have kept a record since October, 1888. Even in that place, so muc...h abused for its summer fogs and winter rains, there is a considerable majority of the nights free from fogs and clouds. Out of 1253 nights, I have a record of 11 82; of these, 645 were unobscured by cloud or fog, and 537 obscured. Many of them were first-class observing nights, in which the highest power of the telescope could be used with advantage, and the remainder of the 645 were more or less satisfactory with lower powers.
But you may have neither optical or photographic apparatus, nor the opportunity or taste for observation.
What to read after Address of William M Pierson Retiring President of the Society At the Fourth?
You can find similar books in the "Read Also" column, or choose other free books by William M Pierson to read onlineMoreLess
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