add REVERSE_FOV_LON global #16

Job	Run time
Black check	16s
Linux python 3.9 conda-build all-deps	7m 35s
ubuntu-latest, py311-test-alldeps_noray	3m 54s
Linux python 3.9 sphinx all-deps	18m 44s
ubuntu-latest, py310-test-alldeps-cov	3m 54s
macos-latest, py311-test	3m 38s
macos-14, py311-test	1m 31s
windows-latest, py311-test-alldeps_noray	3m 36s
ubuntu-latest, py312-test-alldeps_noray	3m 54s
ubuntu-latest, py310-test	2m 15s
ubuntu-latest, codestyle	19s
ubuntu-latest, py39-test-alldeps_noray-astropy50-numpy121	2m 28s
ubuntu-latest, oldestdeps	2m 33s
ubuntu-latest, devdeps	3m 53s
	58m 30s

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