heliographic

adjective
he·​lio·​graph·​ic | \ ˌhē-lē-ə-ˈgra-fik How to pronounce heliographic (audio) \

Definition of heliographic

: measured on the sun's disk heliographic latitude

First Known Use of heliographic

1706, in the meaning defined above

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The first known use of heliographic was in 1706

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