This total eclipse of the moon on 15 April 2014 will be visible in full over the USA, from dusk for Australia and before dawn in Britain. Its position helps to visually calculate the position of the celestial equator and ecliptic.
It is first in a tetrad, a group of four total lunar eclipses over two years. These total eclipses are known as blood moons because dust turns the moon red.
Dates for the eight tetrads this century are here.
This eclipse position is adjacent to the planet Mars, in a position where Mars will spend February and March before going retrograde until May. Look at Mars in February and March to see where the eclipse will be in April
This diagram of the eclipse point against the background stars illustrates how to find the equinox point between Virgo and Leo, where the two lines of the ecliptic and the equator cross, on the other side of Mars from the eclipsed moon. The moon is on the ecliptic, the path of stars followed by the sun. At the equinox the sun crosses this point from north to south of the equator.
Eclipses at this same point in the sky were observed on 21 March 134 BC by Hipparchus, and on 23 March 4 BC in Jerusalem. Hipparchus apparently used the position of the adjacent bright star Spica to calculate the speed of precession of the equinoxes. This point, with the moon 'at the foot of the woman', has precessed by about 25 days against the seasons since ancient times.