Lat: 4.5°N, Long: 61.1°E, Diam: 53 km, Depth: 2.75 km, Rükl: 38
- Apollonius N, the 9th item in C.A.Wood's list of Concentric Craters (1978), is noticeable on the Hi-Res scan of Lunar Orbiter 4's photograph LOIV-184-h1. Because of the oblique look at it (at the region of Apollonius and Apollonius N) it's rather difficult to locate both of them. But... once you have detected the dark-floored Firmicus, it will be an easy task to discover Apollonius N. In this online scan of LOIV-184-h1, we are looking "upside down" at the Apollonius region (north toward the bottom). The Concentric Crater Apollonius N is "just above" the dark-floored Firmicus (in reality it's SOUTH of Firmicus).
- Concentric Crater Apollonius N was also captured on Apollo 17's orbital ITEK-panoramic frame AS17-P-2914 (scroll all the way toward the frame's right margin, and you'll see it).
- It (CC Apollonius N) is also noticeable on the oblique southward looking ITEK frame AS17-P-2595.
- The remarkable "flower"-like appearance of CC Apollonius N (during high solar illumination) is noticeable on Apollo 17's ITEK frames AS17-P-9440 and AS17-P-9445.
- Research: Danny Caes
(IAU Directions) APOLLONIUS.--A ring-plain, 30 miles in diameter, standing in the mountainous region S. of the Mare Crisium. There is a large crater on the S.E. wall, and another, somewhat smaller, adjoining it on the N. There are many brilliant craters in the vicinity.
- Depth data from Kurt Fisher database
- Pike, 1976: 2.75 km
- Westfall, 2000: 2.75 km
- Viscardy, 1985: 1.7 km
- Cherrington, 1969: 1.95 km
- Apollonius N concentric crater (east of Apollonius, south of Firmicus).
- Apollonius W is a thermal anomaly crater, implying a youthful age - Moore et al, 1980
- Satellite craters Apollonius B and L are on the ALPO list of banded craters
- Apollonius of Perga; Greek mathematician (c. 262-190 B.C.).
- A region near Apollonius was once known as the Bitterroot Meadows. This name (nickname) appeared on a moonmap which was included in the LPOD of February the 11th, 2004.
- Southeast of Mare Crisium (near Condorcet, Auzout, Firmicus, and Apollonius) runs the unofficially named North Valley/ Vallis North; or Vermiform Valley. These unofficial names are included in the Hitchhiker's Guide to Rukl 38.