Meanings of spectral class in English

Make one high open ended roll to determine the star's spectral class.

Throughout human history Tau Ceti was a nondescript fifth magnitude star of spectral class K0.

First, the star's color is determined by the spectral class, as shown on the chart.

A main-sequence star, luminosity one, spectral class G, right in the middle of the Hertzsprung-Russell diagram.

The columns each denote a spectral class, from temperature rating 0 to 9.

Once that is determined, roll one percentile die to determine the star's relative temperature rating within the spectral class.

Once the spectral class of the primary has been determined, find the stellar type by rolling one percentile die:

Find the spectral class along the top of the chart and then roll to find the natural satellite grouping and number:

The spectral class (color and temperature) and stellar type (sequence) of any star are determined as per the procedure below.

The average velocities of the brighter stars of the different spectral classes, as determined with the D. O.

Stomatopod crustaceans have complex visual systems containing up to 16 different spectral classes of photoreceptors, more than described for any other animal.

The first order of business was to isolate and determine the exact spectral classes of the most brilliant stars in the vicinity.