By Laurence A. Marschall (auth.)

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There is a distinetion, however. The Doppler shift measures only the speed of approach or recession of astar; the proper motion measures only the motion of the star perpendicular to our line of sight. Usually a star does both, and astronomers must combine proper motion measurements with Doppler shift measurements to determine the true motion of the star through space. Doppler shifts have been used to demonstrate that many stars that appear to be single actually have companions. Pairs of stars that appear dose together are not difficult to spot.

The exact distance of a color from one end of the spectrum thus depends on its wavelength. Rather than print spectra in color, working scientists sometimes present them in black and white, usually with blue to the left and red to the right. It is becoming even more common to present a spectrum simply as a graph showing the intensity of light at different wavelengths. To study the mixture of wavelengths in starlight, astronomers attach a device called a spectrograph to a telescope. s -> 1I1 > -> '~ \ Cl) 10

That is all. The best known example of this type of reporting is the Star of Bethlehem, an apparition mentioned in only one place in the New Testament: Matthew, Chapter 2. There we read that wise men came 44 Chapter 3 to see Herod the King, Slaying, " Where is he that is born King of the Jews? " Would a modern astronomer countenance such data-taking? Where are the celestial coordinates of the star? Magnitude estimates? Descriptions of form and of color? Later in the same passage Herod "inquired of them diligently what time the star appeared.

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