| ASTROLABE | Instrument formerly used to measure the altitude of stars and planets and as a navigational aid |
| GRAIN | Unit of mass equal to a seed of com; 1/4 of a carat formerly used to measure diamonds/pearls; or, a unit used to weigh archers' arrows (5) |
| HAND | A forehock of pork; a bunch of bananas; a round of applause; or, an approximately 4"-wide extremity formerly used to measure a horse (4) |
| RATTLES | Chatterers; crackling noises of paper; dice-boxes; maracas, shakers or toys resembling thus; or, watchmens' instruments formerly used to produce whirring sounds (7) |
| EXTANT | The top is missing from a navigational aid still in use |
| COMPASS | Completely enclose a navigational aid (7) |
| ASTROLOGY | Study of the supposed influence of stars and planets on our affairs (9) |
| OCTANS | Said to resemble a navigational instrument, a constellation named by Lacaille with 13 others including the "Air Pump", the "Chisel", the "Compasses" and the "Easel" (6) |
| ASTRONOMICAL | Relating to the scientific study of the stars, planets and the universe as a whole (12) |
| PTOLEMY | Ancient Egyptian astronomer whose "Almagest" described the motion of stars and planets |
| GALAXY | Group of billions of stars and planets (6) |
| ORRERY | Clockwork model of the solar system showing the movements of the planets and moons around the Sun (6) |
| HIGHNESS | The altitude of a prince's address (8) |
| QUADRANT | Old instrument for measuring the altitude of heavenly bodies (8) |
| ASTRONOMY | Study of stars and planets (9) |
| ALPHACENTAURI | Relatively close system of stars and planets (5,8) |
| DARJEELING | Town in West Bengal at an altitude of 6,700 ft, site of the Chamong Estate and the Happy Valley Tea Estate where the "champagne of teas" is cultivated (10) |
| NAIROBI | Situated between Kampala and Mombasa and rising to an altitude of 5,889 ft, the capital of Kenya (7) |
| NEPHOSCOPE | Cloud observer for measuring the altitude, apparent velocity and direction of such as a nimbus (10) |
| NEEDLE | Leaf of a fir or pine tree; pointer on a navigational compass; a stylus; or, an implement used in pairs for knitting (6) |
