iPad: full landscape is available for Comparison/Composite charts. Not applicable to the iPhone as the iPhone shows only portrait orientation.

However, just to be clear, AC for iPhone can calculate and view synastry charts (comparison and composite) – see screenshots below for a (fictitious) comparison chart.

Note: Synastry comparison charts can’t be progressed or directed or have transits applied, etc. Composite charts can but are reckoned by many to be ineffective.

The comparison restrictions are due to the construction of a synastry comparison chart and not a restriction imposed by AC.

iPhone 12, screenshot. AC ver 1.44

Comparison chart

Speculum

Comparison chart – Aspects

Create

Create Synastry charts here

Settings

Settings

New Synastry Orb Settings

Synastry Help Info

When the Natal percentage slider is set to 100%, natal orbs are used without any changes.

Animated GIF – for fixed orb. The orb applies to Comparison and Composite charts.

Synastry Orbs

Composite charts

This is the calculation of the shortest arc between two planets or points from each chart. For example, the shortest arc between chart 1’s Sun and chart 2’s Sun is calculated. This becomes the composite relationship position of the Sun. And so on… This chart can be saved and progressed etc as a natal chart. Various options will be available.

Note: Comparison and Composite charts can be saved to Your Charts.

What type of composite chart is available?

• Natal Composite chart: single wheel

• Transits to a natal composite chart: bi-wheel

• Secondary progressed composite chart: single wheel

• Secondary progressed composite chart with composite natal chart: bi-wheel

• All other functions are available to composite and comparison charts eg Fixed Star aspects, Terms, etc
• Returns and Solar Arc directions are not available for Composite charts

Some composite chart calculation details

A composite natal chart calculates the midpoints between two selectable natal charts from Your Charts table or from a saved composite chart.
A secondary progressed composite chart is calculated from the two natal charts that comprise a composite chart.

To construct a bi-wheel the following calculations take place:

Calculate the midpoints between two natal charts.
Calculate the midpoints between the two progressed natal charts. Each chart is individually progressed.

Declinations/latitudes

Composite declinations/latitudes are not taken into account.

Day or Hour Lord

Is not possible to calculate the Day or Hour Lord for synastry charts.

Parts/lots

All parts/lots, eg part of fortune, are calculated from the new composite values of the Asc, Moon etc. The midpoints for the vertex and East Point are also calculated in a similar way.

Fixed Stars aspects:

Fixed star aspects represent a challenge for composite and comparison charts. Which epoch should be used? Consider that if two natal charts of very different years of birth are used to construct a composite chart how do we decide which year (epoch) to use to calculate the fixed star aspects? The composite chart has no year of birth, nor a day of birth or a place of birth. It is entirely astronomically artificial. So what to do?

The epoch is taken from the first named natal chart date. If the difference in years between the two natal charts is insignificant, possibly less than 50 years, the aspects will be accurate enough. For instance in the composite chart of Queen Victoria and Prince Albert they were both born on 1819. The fixed stars calculation can use the 1819 date as the epoch without any concern as to relevance and accuracy. This also applies to comparison synastry charts.

Example Composite Natal Chart

Composite Chart – Queen Victoria and Prince Albert

Composite Chart – Queen Victoria and Prince Albert full landscape

To include Prince Albert and Queen Victoria charts in Your Charts list please download this csv file and copy to your AstroConnexions DropBox app folder. Then use the Import AC Provided charts option. Import them into Your Charts. You may need a PC to do this. I’m not sure if the iPad can do this? Please note synastry charts are only available when using the Your Charts database.

Example Composite Bi-Wheel Secondary Progressed Chart

Queen Victoria and Prince Albert progressed Composite with (new feature for all bi-wheels) progressed to natal aspect lines – showing the progressed Moon aspecting natal Venus and natal Part of Spirit

Queen Victoria and Prince Albert progressed Composite with progressed to natal aspect lines – showing the progressed Moon aspecting natal Venus via the Moon’s aspect record.

Chart listing choice for composite charts 

Natal Chart List for Composite – Entering a composite chart name (usually by entering the second chart’s name – the first chart’s name is automatically entered by AC – it’s editable) and choosing the second chart by tapping a chart name record.

Synastry options

Synastry Composite options

For single-wheel synastry charts there is a choice of using the already defined natal orb, or a fixed orb. For bi-wheel charts: (secondary progressed composite charts) the standard orb for progressed charts is used.

Synastry: Full Landscape Options

fi Full Landscape Options for Synastry

Understanding how AstroConnexions displays them

Natal Chart display – this is the midpoint combination of two natal charts. Not including the parts/lots. Note the Vertex and East Point are also midpoint values.

Here’s an example:

Composite Chart – Natal

Here’s the above chart secondary progressed:

Composite Chart – Progressed

Here’s the same composite natal with the progressed composite on the outside of the natal composite chart:

Composite Chart – Natal and Progressed

Her’s the same configuration but displayed full landscape:

Composite Chart – Natal and Progressed Chart Full Landscape

See also : Synastry Orbs

Synastry: revised and updated – scroll to bottom of this page. From AC ver 2.52

Select either Composite or Comparison synastry chart – long-press the Synastry button and select.

Synastry Menu Item

Synastry Orb Settings and composite midpoint Venus Mercury choice

Note that the individual natal charts (destined to create the synastry chart) have initially to be created in AC, or imported into AC.

1. Select and display a Natal chart – it must be a natal chart. Other types of charts can’t be used for synastry charts.
2. Tap Synastry. A list of all your Natal charts is presented. AC conveniently only displays natal charts.

Natal Chart List for Composite

       3. Enter a unique Composite or Comparison chart name. In the example above the initial chart name is Queen Victoria. For a synastry chart name add + Albert. So now it reads Queen Victoria + Albert. Or You could write Queen Vic and Albert, or whatever you like.

       4. Tap the associated second Natal chart record from the list. Albert, Prince Consort in this example.

The synastry chart is saved immediately to Your Charts database with the name Queen Victoria + Albert (Comparison). The type of synastry chart is appended to the chart name by AC.

Note: Comparison and Composite synastry charts are considered to be Natal charts for the purposes of AC.

Therefore to select a Comparison and Composite chart just do as you would a normal natal or horary chart.

Day or Hour Lords are not shown for Synastry charts.

See also How AC displays Composite charts

Synastry: revised and updated to ensure keyboard doesn’t obscure the File Name text field

Available from AC ver 2.52

Synastry new position for file name text field. It was at the bottom of the Chart table.

Keyboard doesn’t cover the File Name text field

Synastry file name