Daytime And Evening Exercises in Astronomy, for Schools And Colleges
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To quickly assess the difficulty of the text, read a short excerpt:
39) taken with a twenty-inch reflector, with three hours' exposure.
Compare the photographs, identifying some of the stars.
Decide whether one photograph has more stars on it than the other.
3. Measure on Roberts's photograph with a scale, and record in minutes of arc the angular distance between the centers of the condensations. The scale is given in the text opposite the plate.
4. Find, and record in millimeters from the lower left corner, the coordinates of six double stars that you can find... on the plate, separated from each other less than twenty-four seconds of arc, that is, less than one millimeter.
5. Find the fiducial stars on Roberts's photograph. Iden- tify them on the Goodsell Observatory photograph, then on Durchmusterung Chart, Number 25.
6. This cluster should be found in the sky. It is a fine type of a loose cluster. In the telescope it shows curves and " festoons " of stars of great beauty. There are two yellow and five red stars. Trouvelot mapped six hundred sixty-four stars.
What to read after Daytime And Evening Exercises in Astronomy, for Schools And Colleges?
You can find similar books in the "Read Also" column, or choose other free books by Whiting, Sarah Frances, 1847- to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
39) taken with a twenty-inch reflector, with three hours' exposure.
Compare the photographs, identifying some of the stars.
Decide whether one photograph has more stars on it than the other.
3. Measure on Roberts's photograph with a scale, and record in minutes of arc the angular distance between the centers of the condensations. The scale is given in the text opposite the plate.
4. Find, and record in millimeters from the lower left corner, the coordinates of six double stars that you can find... on the plate, separated from each other less than twenty-four seconds of arc, that is, less than one millimeter.
5. Find the fiducial stars on Roberts's photograph. Iden- tify them on the Goodsell Observatory photograph, then on Durchmusterung Chart, Number 25.
6. This cluster should be found in the sky. It is a fine type of a loose cluster. In the telescope it shows curves and " festoons " of stars of great beauty. There are two yellow and five red stars. Trouvelot mapped six hundred sixty-four stars.
What to read after Daytime And Evening Exercises in Astronomy, for Schools And Colleges?
You can find similar books in the "Read Also" column, or choose other free books by Whiting, Sarah Frances, 1847- to read onlineMoreLess
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