Astronomical timing helps Hurricane Teddy bring Outer Banks flooding
Effects from Hurricane Teddy arrived this weekend as the Moon as at its closest and lined up with the Sun creating the greatest tidal impact.
A view of the equinox from mission control
As the Sun passes directly over the equator, the lines marking day and night on the large world map in NASA's Mission Control Center are straight for a moment. Equal amounts of sunlight are shining on the northern and southern hemispheres.
Equinox vs Equilux
The Equinox arrives Thursday, bringing the beginning of astronomical Spring. While Equinox is Latin for "equal night", that doesn't mean we'll get 12 hours of sunlight on Thursday, that actually happens Monday.
Fall equinox marks the beginning of autumn, but not equal day and night
The word equinox comes from the Latin word equinoxium, meaning "equal day and night." Looking at the Earth from space today, the northern and southern hemisphere receive about the same amount of daylight. But that doesn't mean we'll get exactly 12 hours of sunlight here in Raleigh on the day of the equinox.
Yearly cycle shows how sun progresses north to south
A subsolar point has been moving southward since it paused for a moment over the Tropic of Cancer at the June Solstice which marked the beginning of summer. It will now continue southward until the December Solstice when it will pause over the Tropic of Capricorn before moving northward in this yearly cycle.
Autumn's arrival celebrated differently, at different times around the world
The September equinox occurs on Saturday at 9:54 p.m., marking the beginning of astronomical autumn in the northern hemisphere and spring in the southern hemisphere. The September equinox occurs the instant the Sun crosses the celestial equator, the imaginary line in the sky that extends out from Earth's equator.