By means of tables of houses for different latitudes, one is able to ascertain what degrees of the zodiac appeared upon the Ascendant and the various House cusps on any hour of any day, as calculated from the sidereal time at noon of that day as indicated in the ephemeris. Actually the tables may be said to divide distance by time, showing how many degrees of the ecliptic will pass a given point in two hours, which varies in different latitudes on account of the inclination of the earth's axis.
Uses of, in Directing. By means of the Tables of Houses for the latitude of birth, planets may be directed to the horizon, as follows: In the Asc. column find the longitude of the planet, then take the related location of the cusp of the X' house, and subtract from it the MC. at birth; the result will be the age at which this direction will be effective. To direct to the opposition of the Asc. add 180º to the longitude of the planet. To direct to the MC locate the planet's longitude in the Tenth House column and count the years backwards to the MC at birth. To direct to the opposition of the MC, count backwards to the degree appearing on the IC or cusp of Fourth House at birth. To direct the Asc. or MC to aspects with planets, note the degree in which it will fall, and bring the degree to the Asc. or MC, as if the planet were there.