@inbook{Sweetnam+2000+87+112,
url = {https://doi.org/10.70249/9780871690647-008},
title = {Chapter 4 THE PHYSICS OF HEAVEN AND EARTH},
booktitle = {Command of Light},
booktitle = {Rowland’s School of Physics and the Spectrum, Memoirs, American Philosophical Society (vol. 238)},
author = {George Kean Sweetnam},
publisher = {The American Philosophical Society Press},
address = {Philadelphia, PA},
pages = {87--112},
doi = {doi:10.70249/9780871690647-008},
isbn = {9780871690647},
year = {2000},
lastchecked = {2026-05-04}
}