Updated 3rd September 2025.

PD = Primary Directions

Bounds = Terms

Many parts of this post were written before AC for iPhone was released. Note that although most AC screenshots are for the iPad they apply to the iPhone and Mac too as they share the same underlying code with some minor teaks.

All images/designs/procedures subject to change without notice.

Here’s an excellent introduction to Primary Directions.

Astrological Predictive Techniques | Primary Directions | 1. Ascensions and Bounds

Whitney Houston’s Chart and Primary Directions through the Bounds/Terms (iPad/Mac – same  results for iPhone) – see Seven Stars Astrology link above.

Whitney Housten Chart and PD directions

This post shows AC’s primary direction calculations in comparison with :

• Valens (Mac)

• Morinus (Windows)

• Astro.com (internet)

• Astro Gold ver 9 (Windows)

Note Valens and Morinus invariably agree in their results as Valens is a slimmed-down version of Morinus.

Antiscia

Example Chart: Winston Churchill: Tropical, Mundane. Antiscia. iPad/Mac – ver 3.35, iPhone ver 1.38

“A” prefixed to promissor = Antiscia

“CA” prefixed to promissor = Contra-Antiscia

Note that all antiscia aspects are conjunctions even when contra-antiscia aspects are shown. Enabling (by a tick) the opposition aspect from the Aspect table has no effect on the displayed antiscia aspects.

PD with Antiscia aspects – Churchill #1

PD with Antiscia and Contra aspects – Churchill #1

PD with Antiscia aspects – Churchill #2

PD with Antiscia and Contra aspects – Churchill #2

For comparison: Morinus – Churchill tropical antiscia aspects Primary Directions mundane example

Morinus Churchill tropical antiscia aspects Primary Directions mundane example

iPhone

PD with Antiscia and Contra aspects – Churchill – iPhone

Settings

Antiscia PD Settings for Results table

Note: Lat and long adjusted to Morinus’ lat and long for Churchill.

Primary Directions through the bounds/terms

Example Chart: Winston Churchill: Sidereal. Placidus cusps, Egyptian Terms/Bounds, Zodiacal.

Terms to Asc.

AC Churchill Sidereal Terms to Asc Primary Directions zodiacal

AC Churchill Sidereal Terms to Asc Primary Directions zodiacal #2

Morinus Churchill Sidereal Terms to Asc Primary Directions zodiacal

Example Chart: King Charles III, aka Prince Charles: Tropical. Placidus cusps

Note that all King Charles III charts have their lat and long adjusted to match the Astro.com chart so that comparisons are geographically valid.

AC Chart

AC King Charles III natal

Solar Fire Chart

Solar Fire King Charles natal

Speculum (natal) comparison (especially for Asc, MC), with lat and longitude as per astro.com, 51°N30’00” 00°W10’00” :

Astrodatabank

Valens speculum

Valens – Speculum King Charles

AstroConnexions Speculum

AC – Speculum King Charles

Primary Direction, Saturn Trine MC, promissor no latitude, calculation results comparison

Valens results

Valens King Charles Primary Direction Saturn Trine MC

AC results

Primary Directions King Charles III

Primary Direction, Saturn Trine MC, with promissor latitude, calculation results comparison

AC results

Primary Directions King Charles III – Promissor

Valens results

Valens Saturn trine MC King Charles with Lat Naibod key

Latest AC PD view

Latest AC PD

Promissor’s directed to the ASC. No latitude. Added 39 secs to birth date

AC

Aspects to the ASC results

Morinus (MS Windows) comparison:

Morinus King Charles aspects to the ASC no latitude

Moon aspects to King Charles III – direct and converse

AC King Charles PDs Results Moon aspects to ASC

Valens results

Valens King Charles PDs Results Moon aspects to ASC

AC latest PD view

Interplanetary PD aspects – Tropical

Valens PD Mercury aspects to Mars – Einstein

Valens PD Mercury aspects to Mars Einstein

AC Mercury aspects to Mars – Einstein

AC PD Mercury aspects to Mars Einstein

PD Terms/Bounds as Promissors to ASC

Einstein PD terms to Asc – Morinus (Windows) – Direct

AC Einstein PD Terms to Asc – Direct

AC Einstein Terms to Asc

Einstein PD terms to Asc – Morinus (Windows) – Converse

Morinus Einstein tropical Terms to Asc converse

AC Einstein Terms to Asc – Converse

AC Einstein Terms to Asc PD aspects

AC Einstein Terms to Asc PD aspects – more

Sidereal Examples, Sassanian ayanamsha

AC Allen Ginsberg Sidereal PD terms to Asc and Desc

Terms – sidereal Ginsberg

Morinus – Ginsberg Sidereal PD terms to Asc and Desc

Morinus Ginsberg Sidereal Terms to Asc sass

Calculating Terms as Promissors – tropical. for King Charts III.

If the terms are not shown in the chart:

Show terms in the chart

Show terms

Terms wheel choice

Results:

Terms to Asc results

Sidereal Interplanetary Aspects, Sassanian ayanamsha

King Charles III, Jupiter aspecting Moon

AC King Charles III planet to planet Jupiter Moon Sidereal

Morinus results

Morinus King Charles III planet to planet Jupiter Moon Sidereal

Primary Directions. Placidus semi-arc zodiacal, fixed stars as promissors

From AC ver 3.29, AC for iPhone ver 1.34

Comparison with Morinus

Primary Directions Mundane Promissor and Significator for South Node.

Solar Fire Mercury Churchill to true node, asc, mc Primary Directions Mundane Direct

AC Mercury Churchill to true node, asc, mc Primary Directions Mundane Direct

Comparison: Solar Fire Gold ver 9.029 vs AC Mundane Direct aspects to Asc

Please note that the following will apply to the iPad as the code is the same, although the UI is different.

Comparison Solar Fire Gold ver 9.029 vs AC Direct mundane aspects to asc

Comparison Solar Fire Gold ver 9.029 vs Morinus vs AC Direct Mars Sun Mundane aspects to the Sun

Comparison Solar Fire Gold ver 9.029 vs Morinus vs AC Direct Mars Sun mundane aspects to the asc

Rectification – Comparison – Morinus vs AC, Mundane.

Note: if changing from Zodiacal aspects to Mundane aspects or vice versa when using rectification you must start again by changing the chart from Transit to Natal. This only applies to the rectification result.

iPhone model: XR

Al Pacino chart

Morinus rectif mundane moon sq mercury

AC rectif mundane moon sq mercury

Rectification by 5 minutes

Morinus rectif mundane moon sq mercury plus 5 mins

AC rectif mundane moon sq mercury plus 5 mins

Adding 10 seconds

Morinus rectif mundane moon sq mercury plus 10 secs

AC rectif mundane moon sq mercury plus 10 secs

Zodiac settings. Geocentric only. Sidereal or Tropical.

Please note that the Tropical zodiac is the default setting when first installing AC on your iPad. If you have no intention of using the sidereal option there is no need to do anything. Please continue as usual.

All chart screenshots use the Fagan/Bradley ayanamsha.

iPhone screenshot

Example Sidereal Lunar Mansions

To change zodiacs follow these steps:

1.

Settings menu

2.

Settings for zodiac

3.

Zodiac Settings

This is a chart setting so that if a chart is created or edited (and saved) the zodiac will either be Tropical or Sidereal depending on the setting. Tropical is the default, which is mostly used in Europe/USA. The sidereal option is used for Vedic charts – mostly used in India, but not exclusively. Please note that the last two sentences do not reflect the complicated/contentious choice of a zodiac by astrologers!

• Once this setting is changed eg to Sidereal, all charts created will be for the Sidereal zodiac.
• All charts incl Tropical charts edited and saved will then be Sidereal.

To change the currently viewed chart to sidereal:

1. Tap Sidereal on the Zodiac Settings – see screenshot above. Exit settings.
2. Go to Options and tap Edit Chart, and then tap Save – see screenshots below. All done.

Edit a chart

Save a chart

Ayanamsha

Ayanamsha table

Example Natal Chart – Albert Einstein

Einstein Sidereal Natal

if you haven’t named your charts either tropical or sidereal as in the above chart which is named Albert Einstein – Sidereal, how to recognise if a chart is tropical or sidereal?

Look to the top right, if it doesn’t say Tropical then it’s Sidereal. You’ll see an ayanamsha if it’s sidereal. In this case Fagan/Bradley.

Filter Your Charts

Tap All, Tropical or Sidereal and tap away on the chart area to dismiss the Filter Chart record dialog. The Chart record table will then be updated with your choice of filter.

The Filter Chart Records setting does not apply to the Provided Charts table listing.

Filter Chart records

New and Edit Chart helpful Zodiac indicator

New Chart Sidereal Warning/Indicator

New Chart Tropical Warning/Indicator

This can be useful if Sidereal charts and/or Tropical charts are being created.

This can be turned off. By default this setting is off.

Zodiac type Warning/Indicator – settings

Sidereal Chart Comparison. AC and Solar Fire Gold

Knowledge Base – Sidereal Chart Comparison