Desperately Seeking House Cusps

As you may recall, house cusps are the places where the houses begin. If you look at Spielberg's chart, you'll see these lines, with a sign and degrees on each, dividing the houses.

Now that the computer has Spielberg's sidereal time, it's going to "look up" the houses in a table similar to what we're showing you. This is a page from the AFA Table of Houses, Placidus System.

23h 24ra 0

MC

351'

' 0'

0"

23" 28m 0

MC

352*

' 0'

0"

N

X 20* 12' 19"

X

21o ir 2r

N

LAT

11

12 Ascendant

2

3

11

12

Ascendant 2

3

LAT

0

T22 42.3

Ö23 23.4

E21 43.9

©19 24.1

S}18 34.0

V23 46.0

Ö24 22.0

H22 39.2

©20 20.3

*J19 35.0

S

22 59.0

24 30.5

23 43.1

20 39.5

19

1.5

24 3.5

25 29.8

24 38.5

21 35.3

20

2.0

5

10

23 16.5

25 40.6

25 45.1

21 54.9

19

29.0

24 21.7

26 40.7

26 40.5

22 50.3

20 28.9

10

15

23 34.9

26 55.1

27 51.5

23 11.4

19 56,8

24 40.9

27 55.9

28 46.8

24 6.2

20 56.1

15

16

23 38.8

27 10.7

28 17.5

23 26,9

20

2.4

24 45.0

28 11.6

29 12.8

24 21.6

21

1.6

16

17

23 42.7

27 26.5

28 43.8

23 42.5

20

8.1

24 49.0

28 27.5

29 39.0

24 37.2

21

7.2

17

18

23 46.6

27 42.6

29 10.4

23 58.3

20

13.8

24 53.1

28 43.8

© 0 5.5

24 52.8

21

12.8

18

19

23 50.6

27 59.0

29 37.2

24 14.1

20

19.6

24 57.3

29 0.3

0 32.3

25 8.5

21

18.5

19

20

23 54.7

28 15.7

© 0 4.4

24 30.1

20

25.4

25 1.6

29 17.1

0 59.4

25 24.4

21

24.2

20

21

23 58.9

28 32.7

0 32.0

24 46.3

20 31.2

25 6.0

29 34.3

1 26.9

25 40.4

21

29.9

21

22

24 3.2

28 50.1

0 59.9

25 2.6

20

37.1

25 10.4

29 51.8

1 54.7

25 56.6

21

35.7

22

23

24 7.5

29 7.8

1 28.2

25 19.0

20 43.1

25 14.9

H 0 9.7

2 22.9

26 12.9

21

41.6

23

24

24 12.0

29 26.0

1 56.9

25 35.7

20 49.2

25 19.6

0 27.9

2 51.5

26 29.4

21

47.5

24

25

24 16.5

29 44.5

2 26.1

25 52.5

20 55.3

25 24.3

0 46.6

3 20.5

26 46.1

21

53.5

25

26

24 21.1

B 0 3.5

2 55.7

26 9.6

21

1.5

25 29.!

1 5.7

3 50.0

27 3.0

21

59.5

26

27

24 25.9

0 23.0

3 25.7

26 26.9

21

7.8

25 34.0

1 25.3

4 19.9

27 20.2

22

5.7

27

28

24 30.7

0 42.9

3 56.3

26 44.4

21

14.1

25 39.1

1 45,4

4 50.4

27 37.5

22

11.9

28

29

24 35.7

1 3.4

4 27.5

27 2.1

21

20.6

25 44.3

2 6:0

5 21.3

27 55.J

22

18.2

29

30

24 40-8

1 24.5

4 59.1

27 20.2

21

27.1

25 49.6

2 27.2

5 52.9

28 13.0

22 24.7

30

31

24 46.1

1 46.1

5 31.4

27 38.5

21

33.8

25 55.1

2 49.0

6 25.0

28 31.1

22

31.2

31

32

24 51.5

2 8.4

6 4.3

27 57.1

21

40.6

26 0.7

3 11.4

6 57.7

28 49.5

22 37.8

32

33

24 57.0

2 31-4

6 37.9

28 16.0

21

47.5

26 6.5

3 34.5

7 31.0

29 8.3

22

44.6

33

34

25 2.8

2 55.1

7 12.1

28 35.3

21

54.5

26 12.5

3 58.3

8 5.0

29 27.4

22

51.4

34

35

25 8.7

3 19.6

7 47.1

28 54.9

22

1.6

26 18.7

4 22.9

8 39.8

29 46.8

22 58-4

35

36

25 14.8

3 44.9

8 22.9

29 15.0

22

9.0

26 25.1

4 48.4

9 15.3

0 0 6.6

23

5.6

36

37

25 21.1

4 11.2

8 59.4

29 35.4

22

16.4

26 31.6

5 14.7

9 51.5

0 26.8

23

12.9

37

38

25 27.7

4 38.4

9 36.8

29 56.2

22

24.0

26 38.5

5 42.1

10 28-6

0 47.4

23

20.3

38

39

25 34.5

5 6.6

10 15.1

$ 0 17.5

22 31.8

26 45.5

6 10.4

11 6.6

1 8.5

23 28.0

39

40

25 41.5

5 36.0

10 54.3

0 39.3

22

39,8

26 52.9

6 39.9

11 45.5

1 30.0

23 35.8

40

41

25 48-9

6 6.6

11 34.5

I 1.6

22 48.0

27 0.5

7 10.5

12 25.4

1 52.1

23 43.7

41

42

25 56.5

6 38-4

12 15.8

1 24.5

22 56,4

27 8.5

7 42.5

13 6.3

2 14.7

23

51.9

42

43

26 4.5

7 11.7

12 58.1

I 47.9

23

5.0

27 16.7

8 15.8

13 48.2

2 37.8

24

0,4

43

44

26 12.8

7 46.5

13 41.6

2 12.0

23

13.8

27 25.4

8 50.7

14 31.3

3 1.6

24

9.0

44

A page from the AFA Table of Houses.

Excerpts from the AFA Table of Houses, Placidus System are reproduced with the permission of Gregg Howe of Astro Numeric Service and the American Federation of Astrologers, Inc. Copyright 1988 by the American Federation of Astrologers, Inc.

The computer is going to look up the sidereal time closest to Spielberg's calculated sidereal time. Since it's really, really, really important to have the right sidereal time before going on to this step, it's a good thing we've got computers to do this for us!

Notice the sidereal times in the top left-hand corner of each box and you'll see that the table on the left is for 23 hours, 24 minutes, 0 seconds. The table on the right is for the sidereal time of 23 hours, 28 minutes, 0 seconds.

Interpolating the houses means finding the correct positions between two sidereal times for them.

Star-Crossed

Correcting for latitude can make an enormous difference. In Spielberg's case, most of his house cusps are about 35 to 45 minutes later than shown in the table of houses. That's not a big difference, but in some charts, this is enough for a planet to move to a different house, or for an ascendant, or M.C., to change signs—and we all know how star-crossed that could be!

Interpolating the houses means finding the correct positions between two sidereal times for them.

K

You can see that Spielberg's sidereal time of 23 hours, 25 minutes, 49 seconds is in between those two sidereal times. So the computer knows that it's going to have to interpolate between these house tables to get the right houses for Spielberg. Lucky for us, we don't have to know what those steps are! But there are a few things we can understand easily.

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