Astronomy
Explore the universe with our astronomy guides, constellations, and star map history.
Natal Chart, Birth Chart, Star Map: Never Confuse Them Again
A natal chart and a birth chart are the same thing: an astrological reading of the planets at your birth. A star map is an astronomical view of the stars actually visible. The guide that finally settles the vocabulary.
June 8, 2026 · 6 min read
Sun Sign, Moon Sign, Rising Sign: The Difference (and Which One Shows on a Star Map)
Your sun sign says who you are, your moon sign what you feel, your rising sign what you show. Here's the real difference in 30 seconds — and why only the sun sign and the real constellations appear on a star map.
June 8, 2026 · 6 min read
Zodiac Constellations Guide: The 12 Star Signs in the Night Sky
Explore the 12 zodiac constellations, their mythology, how to find them in the night sky, and why they've captivated humanity for thousands of years.
May 25, 2026 · 8 min read
Astronomy for Beginners: Your Complete Guide to Understanding the Night Sky
New to astronomy? Learn the basics of stargazing, constellations, planets, and celestial navigation in this comprehensive beginner's guide to the night sky.
May 18, 2026 · 9 min read
Can a Star Map Show a Date Before 1900?
Yes — OwnStarMap renders any date from year 1 CE forward, including pre-1900 dates, because the IAU sidereal time algorithm is calculus-based, not catalog-based.
May 12, 2026 · 5 min read
Do Star Maps Show the Moon and Planets?
Yes — OwnStarMap renders the moon's exact phase and position, plus visible planets (Venus, Mars, Jupiter, Saturn) for your chosen date and location.
May 12, 2026 · 6 min read
How Accurate Are Personalized Star Maps?
Personalized star maps from OwnStarMap are astronomically accurate within fractions of a degree — IAU 2006 algorithm, HYG v4.2 catalog, stereographic projection.
May 12, 2026 · 6 min read
The 10 Brightest Stars You Can See From the US Tonight
A field guide to the 10 brightest stars visible from the continental US — magnitudes, host constellations, best seasons, and how to spot each one from your latitude.
May 11, 2026 · 7 min read
How a Personalized Star Map Is Generated (The Science Behind It)
A clear, step-by-step explanation of how a personalized star map is calculated and rendered — from sidereal time to stereographic projection to a 300 DPI print file.
May 11, 2026 · 7 min read