reduce the number of calls to CelestialRotation
reduce the number of calls to CelestialRotation

pleroy/Principia,pleroy/Principia,eggrobin/Principia,mockingbirdnest/Principia,eggrobin/Principia,eggrobin/Principia,pleroy/Principia,mockingbirdnest/Principia,mockingbirdnest/Principia,pleroy/Principia,mockingbirdnest/Principia