Noble, observations of Mercury, [246];
secondary tail of comet, [355]

Nolan, origin of the moon, [317];
period of Phobos, [320]

Norton, expulsion theory of solar appendages, 193 note;
comets' tails, [345] [347]

Nova Andromedæ, [394] [395]

Nova Aurigæ, [396]-399

Nova Cygni, [393] [394] [398]

Nova Persei, [400] [401]

Nutation, discovered by Bradley, [3],[ 15];
a uranographical correction,[ 31]

Nyrén, constant of aberration, [241]

Observatory, Greenwich, [3],[ 27], [433];
Cape of Good Hope, 6,[ 36], [433]
Paramatta, 6,[ 90]
Harvard College, 7,[ 85]
Königsberg,[ 30]
Dorpat,[ 43]
Pulkowa,[ 44]
Palermo,[ 72]
Berlin,[ 90]
Anclam, [149]
Potsdam, [149]
Kew, [153]
Arequipa, [264] [435] [436]
Yerkes, [433]
Lick, [435]