Calculator Input
Enter birth details. Use east longitude as positive and west longitude as negative.
Example Data Table
Use these sample values to test the calculator quickly.
| Name | Date | Time | Time Zone | Latitude | Longitude | Use Case |
|---|---|---|---|---|---|---|
| Sample A | 1990-01-01 | 12:00 | 0 | 51.5074 | -0.1278 | London tropical chart |
| Sample B | 1988-08-22 | 06:30 | 5 | 24.8607 | 67.0011 | Karachi morning chart |
| Sample C | 2001-12-15 | 21:15 | -5 | 40.7128 | -74.0060 | New York evening chart |
Formula Used
Julian Day:
JD = Unix UTC timestamp / 86400 + 2440587.5
Solar longitude approximation:
Sun = L + 1.915 sin(g) + 0.020 sin(2g)
Angular separation:
Separation = min(|A - B|, 360 - |A - B|)
Equal house placement:
House = floor(normalize(planet longitude - first cusp) / 30) + 1
The calculator converts local birth time into UTC. Then it estimates planetary longitudes from the Julian Day. The rising sign uses local sidereal time, latitude, longitude, and obliquity. Houses are calculated with equal, whole sign, or solar methods. Aspects are found by comparing angular distance between chart points.
How to Use This Calculator
- Enter the birth date and exact birth time.
- Add the time zone offset for the birth location.
- Enter latitude and longitude for the birthplace.
- Choose tropical or sidereal zodiac mode.
- Select the house method and aspect orb.
- Press the calculate button.
- Review signs, houses, aspects, and balance tables.
- Download the CSV or PDF file for later study.
Birth Chart Guide
What a Birth Chart Shows
A birth chart is a symbolic sky map. It uses date, time, and birthplace. The chart shows zodiac signs, houses, and aspects. Each part adds a different layer. The Sun describes core vitality. The Moon describes inner reactions. The Ascendant describes first impressions. Houses show life areas. Aspects show links between chart points.
Why Birth Time Matters
Birth time changes the rising sign quickly. It also changes house placements. A difference of minutes can matter. This is especially true near sign borders. Use a birth certificate when possible. If the time is unknown, use noon. Then treat houses and angles as estimates.
Using Signs and Houses
Signs describe style and tone. Houses describe where energy appears. A planet in Aries acts directly. A planet in the tenth house affects career themes. Reading both together gives a richer result. The ruler of the rising sign is also useful. Many astrologers call it the chart ruler.
Reading Aspects
Aspects compare distance between planets. A conjunction blends two points. A trine often feels smooth. A square can show tension. An opposition can show contrast. Orbs control how wide the calculator searches. Smaller orbs create stricter results. Wider orbs create more results.
Element and Modality Balance
Elements group signs into Fire, Earth, Air, and Water. Fire is active and inspired. Earth is practical and grounded. Air is mental and social. Water is emotional and intuitive. Modalities group signs by movement. Cardinal starts. Fixed holds. Mutable adapts. Balance tables help reveal chart emphasis.
Best Use
Use this tool for learning and comparison. Export the result after each calculation. Compare charts across different house methods. Review repeated signs, elements, and aspects. For professional work, verify results with full ephemeris software. This keeps your interpretation careful, clear, and honest.
FAQs
1. What is a birth chart?
A birth chart is a symbolic map of the sky at birth. It shows planets, zodiac signs, houses, and aspects for interpretation.
2. Is exact birth time required?
Exact time is strongly recommended. It affects the rising sign, house cusps, and angle placements. Without it, results are less precise.
3. What time zone should I enter?
Enter the time zone offset used at the birthplace on the birth date. Use positive values east of UTC and negative values west of UTC.
4. What is the rising sign?
The rising sign is the zodiac sign near the eastern horizon at birth. It describes appearance, approach, and first response style.
5. What does aspect orb mean?
Aspect orb is the allowed distance from an exact aspect angle. A smaller orb gives stricter results. A wider orb gives more aspects.
6. Which house method should I choose?
Equal houses are simple and balanced. Whole sign houses are traditional. Solar houses help when the birth time is uncertain.
7. Are the planetary positions exact?
No. This tool uses simplified formulas for educational estimates. Use professional ephemeris software for strict astrological or research work.
8. Can I export my chart?
Yes. Use the CSV button for spreadsheet records. Use the PDF button for a readable summary you can save or share.