@inbook{Ptolemy+1999+507+554,
url = {https://doi.org/10.1515/9780691213361-016},
title = {Book XI},
booktitle = {Ptolemy's Almagest},
author = {Ptolemy},
editor = {G. J. Toomer},
publisher = {Princeton University Press},
address = {Princeton},
pages = {507--554},
doi = {doi:10.1515/9780691213361-016},
isbn = {9780691213361},
year = {1999},
lastchecked = {2026-05-12}
}