| Far from being bodies with physical properties to be investigated, the stars were seen as markers measured in order to construct an accurate, detailed and precise background against which solar, lunar and planetary motions could be charted, primarily for terrestrial applications | |
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| Monthly Notices of the Royal Astronomical Society | "On the radiative equilibrium of the stars" |
… That which is perhaps most characteristic of astrophysics is the special prominence which it gives to the study of radiation.