nonagenary

Of or related to the number ninety.

Synonym of square or quadrature, a rising at a 90 degree angle to the position of another heavenly body, particularly the sun.

As for Mars, as he is neerer to the Sunne, so feeleth he the Sunne beames by a quadrant aspect, to wit, ninetie degrees: wherupon that motion tooke the name, called the first and second Nonagenarie, from both risings.