A longitude the caller asserts is already sidereal (from another program,
a table, a test). The engine cannot check the claim; it records the label.
A declaration key not named in SiderealDeclaration is refused with a
RangeError, so that a misspelt at is not an instant silently left out.
A longitude the caller asserts is already sidereal (from another program, a table, a test). The engine cannot check the claim; it records the label. A declaration key not named in SiderealDeclaration is refused with a RangeError, so that a misspelt
atis not an instant silently left out.