Abstract

A table is presented that gives the total number of hours in the year during which the sun’s altitude exceeds a given value h, for h = 0–88° in 2° increments and for latitudes from the Equator to the North Pole in 2° increments. The table also gives corrections to these figures for the effect of atmospheric refraction and the total hours of daylight at each latitude.

© 1983 Optical Society of America

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References

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  1. R. S. McDowell, J. Atmos. Sci. 31, 1876 (1974); compare the Appendix, p. 1883.
    [CrossRef]
  2. R. S. McDowell, J. Opt. Soc. Am. 69, 1119 (1979).
    [CrossRef]
  3. For example, W. M. Smart, Text-Book on Spherical Astronomy (Cambridge U.P., London, 1944), p. 35.
  4. Ref. 3, pp. 42 ff.
  5. Nautical Almanac for the Year 1966 (Nautical Almanac Office, Washington, D.C., 1964).
  6. B. D. Yallop, F. G. Watson, A. Milsom, Observatory 96, 196 (1976).

1979 (1)

1976 (1)

B. D. Yallop, F. G. Watson, A. Milsom, Observatory 96, 196 (1976).

1974 (1)

R. S. McDowell, J. Atmos. Sci. 31, 1876 (1974); compare the Appendix, p. 1883.
[CrossRef]

McDowell, R. S.

R. S. McDowell, J. Opt. Soc. Am. 69, 1119 (1979).
[CrossRef]

R. S. McDowell, J. Atmos. Sci. 31, 1876 (1974); compare the Appendix, p. 1883.
[CrossRef]

Milsom, A.

B. D. Yallop, F. G. Watson, A. Milsom, Observatory 96, 196 (1976).

Smart, W. M.

For example, W. M. Smart, Text-Book on Spherical Astronomy (Cambridge U.P., London, 1944), p. 35.

Watson, F. G.

B. D. Yallop, F. G. Watson, A. Milsom, Observatory 96, 196 (1976).

Yallop, B. D.

B. D. Yallop, F. G. Watson, A. Milsom, Observatory 96, 196 (1976).

J. Atmos. Sci. (1)

R. S. McDowell, J. Atmos. Sci. 31, 1876 (1974); compare the Appendix, p. 1883.
[CrossRef]

J. Opt. Soc. Am. (1)

Observatory (1)

B. D. Yallop, F. G. Watson, A. Milsom, Observatory 96, 196 (1976).

Other (3)

For example, W. M. Smart, Text-Book on Spherical Astronomy (Cambridge U.P., London, 1944), p. 35.

Ref. 3, pp. 42 ff.

Nautical Almanac for the Year 1966 (Nautical Almanac Office, Washington, D.C., 1964).

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Tables (1)

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Table I Time Sun is Above Elevation h at Latitude ϕ(h/yr)

Equations (3)

Equations on this page are rendered with MathJax. Learn more.

sin h = cos ϕ cos δ cos ( GHA λ ) + sin ϕ sin δ ,
cos ( 15 t h ) = sin ϕ sin δ sin h cos ϕ cos δ = z .
T h = t h t h = 24 ( 2 / 15 ) cos 1 z .

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