It is called an equinox.
There is no such line. The imaginary line through its centre is the axis, which the Earth rotates around; the imaginary line an equal distance from the poles is the equator. Neither make it spin - that is caused by momentum from the planet's formation.
That's one of Johannes Kepler's "Laws" of planetary motion.
Nowhere on Earth. But would be on the equator of any planet which has a circular orbit, and whose axis of rotation is perpendicular to the plane of the orbit. Days and nights are of equal length on the equator of any planet (including Earth). That's kind of what "equator" MEANS. In the situation described above, days and nights would be of equal length everywhere on the planet's surface (and even then the requirement that the orbit be circular is overkill).
In the northern hemisphere, the autumnal equinox marks the first day of fall. An equinox happens twice a year, when the sun shines directly on the equator and the length of day and night is nearly equal.
I don't know the full answer but I got two letters I know: r and t
It is called an equinox.
Yes they are equal because equinox means equal nights.
equater
because night and time together will equal nighttime.
It all depends on your latitude. The closer you are to the equatorial latitudes, the more your days are equal in numbers closer to 12. In all other latitudes, the further you are up towards the poles, the larger the difference is of daytime and nighttime. At the equator, the days and nights are pretty much the same in summer and winter. But near the poles, summer is always in daylight and winter is always in darkness.
march 3rd
That quotient would be an imaginary number. The actual number depends on exactly what imaginary number you divide the 7 by.
an imaginary line, joining the equal elevations of the points
Salinity
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an equator