constant — You use constant to describe something that happens all the time or is always there.
distant — far off or apart in space; not near at hand; remote or removed (often followed by from): a distant place; a town three miles distant from here.
instant — an infinitesimal or very short space of time; a moment: They arrived not an instant too soon.
present — being, existing, or occurring at this time or now; current: increasing respect for the present ruler of the small country.
sextant — an astronomical instrument used to determine latitude and longitude at sea by measuring angular distances, especially the altitudes of sun, moon, and stars.
