According to Charles Jayne, there are 16 significant times (or prenatal epochs) prior to birth for which charts may be cast. There are 16 epochs because there is one prenatal epoch for each planet (10 known and 6 hypothetical). Jayne has developed an extensive and comprehensive philosophical basis for these charts, and discusses them in depth in several of his papers and books.

Jayne’s Hypothetical Planets

Vulcan

period 25 days

Rex

period 40 months (focussed in the asteroid belt)

Sigma

period 13.93 yrs

Isis

period 384 yrs sidereal

Morya

period 640 yrs sidereal

Lion

period 1610 yrs sidereal

Jayne also postulated that, following the birth chart, there are another 32 charts that may be cast for an individual (2 for each planet), and these are known as post-natal epochs. Thus the total number of charts for an individual is 49 in total. These charts are somewhat more complex to calculate than the prenatal charts, and have not been included in Solar Fire. However, all 16 prenatal epoch charts have been included. These are listed below.

Jayne’s Prenatal Charts

Prenatal Epoch of

Abbr

Prenatal Interval

Chart Inter-Relationship

Lunar Phase

Luminary /Angle

Chiron

Y

13.2 yrs

Independent

Trine ¸ (in 5th)

Sunrise

Sigma

S

9 yrs

¸ Cnj C ASC

NM applying

Sunset

Jupiter

Z

8 yrs

¸ Opp F MC

NM or FM separating

Cnj MC

Rex

H

7 yrs

¸ Opp C MC

NM applying

Noon

Venus

R

6 yrs

¸ Opp T ASC

NM or FM separating

Moonset

Mercury

W

5 yrs

¸ Opp B MC

NM or FM separating

Noon

Vulcan

G

4 yrs

Syz B ASC

NM or FM separating

Sunset

Sun

O

22.3 mths

Independent

FM applying/separating

Noon

Moon

Q

15.7 mths

Independent

FM applying/separating

Moonrise

Lion

U

11 mths

Syz B Vtx

-

Sunrise

Uranus

C

9 mths

Syz B ASC

-

ASC Syz B

Isis

I

7.5 mths

Syz B MC

-

Midnight

Pluto

T

6.5 mths

Independent

QM applying

Syz MC

Neptune

A

5 mths

Syz C MC

-

Midnight

Morya

F

3 mths

Independent

QM applying

Syz ASC

Mars

E

2 mths

Syz C Vtx

-

Sunrise

Saturn

B

0

Syz C ASC

-

ASC Syz C

NM=New Moon; FM=Full Moon; QM=Quarter Moon; Syz=Syzygy (i.e. Conjunct or Opposite); Cnj=Conjunct; Opp=Opposite; ASC=Ascendant; MC=Midheaven; Vtx=Vertex

Calculation Procedure for Jaynes Prenatal Charts

Jaynes Law of Sex

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