Spica

Spica is a star in Vir of catalogue visual magnitude 0.98; its declination determines which latitudes can observe it.

The stored catalogue gives a visual magnitude of 0.98. This is a catalogue value, not a prediction of its brightness this week. Lower magnitudes mean brighter objects; sky brightness and altitude affect whether you can see the star.

Its catalogue position is approximately right ascension 13h 25m and declination -11.2°. These reference coordinates describe its sky location; they are not an observing time or a current altitude.

At the almanac’s default latitude of 45° N, this star rises and sets, reaching approximately 34° altitude at upper culmination. These are geometric calculations from declination, excluding refraction and local obstructions. Darkness and the time of culmination must still be checked for the observing date and your location.

How to find it: Trace the curve of the Big Dipper's handle to Arcturus, then continue the same sweep to Spica.

Sources: Star Almanack’s stored fixed-object and expanded Bayer catalogues; accepted constellation figures and guiding-star routes. Visibility limits are original geometric calculations from catalogue declination, not weekly predictions.

Stellar finder for Spica

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