Sky watchers will witness a total lunar eclipse in the early hours of Thursday 21st February, subject to weather conditions. For a total lunar eclipse to occur, the Moon in its orbit around the Earth must pass fully into the cone-shaped shadow of the Earth in space. ... The Moon does not usually go completely dark because the Earth's atmosphere refracts direct sunlight around the edge of the shadow on to the Moon's surface. This causes the Moon to turn a dark, blood-red or copper colour. ...

... Fortran . Storage rules Dummy argument is a quantity in the specification of a procedure, function or subroutine. Actual argument is a quantity in the call of a procedure, function or subroutine. ... Becomes 101 END PROGRAM EXAMPLE SUBROUTINE SUB(X, Y, Z) IMPLICIT NONE REAL, INTENT(IN) :: X REAL, INTENT(INOUT) :: Y REAL, INTENT(OUT) :: Z Y = Y**2 Z = X + Y END SUBROUTINE SUB In Fortran there is really only one kind of argument usage, called argument association. ...