in Astronomy, the approach of any planet to a conjunction with the sun, or a star. It is a step towards a transit, occultation, conjunction, eclipse, &c. Mr Flamsted, M. de la Hire, and others, have given observations of the moon's appulses to the Pleiades. Phil. Trans. No. 76. p. 361. M. Acad. Science, an. 1708.