Declination graph
The Declination Graph is a screen that displays changes in the declination of celestial bodies (their north-south deviation from the celestial equator) as a line graph. The natal (birth-time) declination is shown as a horizontal dashed line, while changes due to transits or progressions/solar arcs are shown as curves, allowing you to visually check for parallel and contraparallel formations and out-of-bounds (OOB) status.
Prerequisite: This screen does not have fields for entering birth data. Please enter and save your birth data on the top page (input screen) first before opening this page. If no data is found, a message saying "No birth data found" will be displayed. After choosing your settings, press the "Show Graph" button (it does not update automatically).
Overall screen: settings panel on the left, graph in the center, P/CP aspect list on the right
1. Screen Layout
There are no tabs; the screen has a three-column layout: left (settings panel), center (graph), and right (P/CP aspect list) (these stack vertically when the screen width is narrow). The left panel contains the birth data display, display mode and period settings, the graph display button, export buttons, the legend, and an explanation of how to read the graph.
2. Display Mode and Period Settings
| Item | Options | Default | Notes |
|---|---|---|---|
| Display mode | Transit / Progression・SA | Transit | The "Period" options change depending on the selection |
| Start date | Date picker | Today | The starting date of the graph |
| Period (for Transit) | 1 month / 3 months / 6 months / 1 year | 6 months | - |
| Period (for Progression・SA) | 5 years / 10 years / 50 years | 10 years | - |
In "Progression・SA" mode, the 10 celestial bodies are calculated using secondary progression, and ASC・MC are calculated using Solar Arc. After choosing your settings, press the "Show Graph" button.
If you want to change the birth data, you can return to the top page using the "Change Natal Data" button.
3. How to Read the Graph
Meaning of the Axes
The horizontal axis (X-axis) is date/time (in Transit mode the scale is monthly, in Progression・SA mode it is yearly), and the vertical axis (Y-axis) is declination (in degrees). Turning ON "Show ±0° at Center" switches to a signed graph in which 0° is at the center, with north declination shown as positive and south declination as negative (when OFF, absolute values are shown).
Types of Lines
| Line | Meaning |
|---|---|
| Dashed line (horizontal) | Natal (birth-time) declination. A reference line that does not move over time |
| Solid line (curve) | Change in declination due to transit or progression・SA |
ASC・MC in Progression・SA mode are drawn as short dashed (dotted-looking) lines, distinguishing them from the other bodies (solid lines). "(SA)" is appended to the end of their display names.
Color coding
Each celestial body is displayed in its own distinct color (the 10 bodies from the Sun and Moon through Pluto, plus ASC・MC in Progression・SA mode). The color swatches in the legend correspond to the line colors on the graph.
Other elements shown on the graph
- Today line: A red vertical dashed line is displayed at the position of the current date/time (only if it falls within the displayed period).
- N/S labels: Labels for north declination (N) and south declination (S) are automatically added at the ends and peaks (maxima/minima) of each line.
- Tooltip: Hovering the mouse over the graph displays a list of the declination values for each celestial body at that date/time.
Hovering the cursor over the graph shows a list of each celestial body's declination value at that date/time
4. Out of Bounds (OOB)
When declination exceeds the obliquity of the ecliptic (approximately 23.44°), it enters a special state called "Out of Bounds." This reference line (23.4393°) is always shown on the graph as a red dashed line. Turning ON the "OOB Background Color" toggle applies a light red background to the range outside this reference line, making the out-of-bounds range immediately visible.
5. List of Parallels / Contraparallels
Coincidences between declinations are treated separately from ecliptic longitude aspects, as "Parallel" and "Contraparallel."
| Term | Meaning |
|---|---|
| Parallel (P) | The moment when the declination of a moving body matches the declination of a natal body with the same sign (north/south) and a similar value |
| Contraparallel (CP) | The moment when the signs are opposite but the absolute values match |
Formed parallels and contraparallels are listed in the "P / CP Aspect List" table on the right side of the graph, along with the date, the moving body, the target natal body, the type (P in blue text, CP in red text), and the degree value. Since individual markers are not shown on the graph itself, check this list table for details.
6. Toggling Display via the Legend
The legend at the bottom of the left panel has two groups, "Natal (horizontal line)" and "Transiting (curve)," with a checkbox for each celestial body. Unchecking a box temporarily hides that body's line from the graph. Use this when there are too many lines and the graph is hard to read.
7. Export (PDF / Copy Table)
| Button | Action |
|---|---|
| 📄 Export PDF | Downloads the currently displayed graph as a landscape A4 PDF (filename "decl_氏名.pdf"). If pressed before displaying a graph, a guidance message is shown. |
| 📋 Copy Table | Copies the P/CP aspect list to the clipboard as tab-separated text. If the list is empty, a message to that effect is displayed. |
8. Useful Specifications to Know
- Time zone: The time zone specified on the settings screen is reflected in the graph's X-axis, the today line, and all date displays in the aspect list.
- The out-of-bounds reference value is fixed: It is fixed at 23.4393° and there is no setting to change it.
- The density of data points is adjusted automatically when you change the period. There is no setting to manually specify a finer interval.
- Nothing updates until you press the "Show Graph" button: Simply changing the display mode, start date, or period does not take effect, so be sure to press the button after making changes.