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Instead of giving the galactic longitude and latitude of a star we may content ourselves with giving the galactic square in which the star is situated.

The fourth column gives the galactic square, the fifth and sixth columns the galactic longitude and latitude.

Adopting, the additional computative burden imposed by it notwithstanding, Schonfeld's modification of Airy's formul�, he introduced into his equations a fifth unknown quantity expressive of a possible stellar drift in galactic longitude.