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?
The editor can preview some four-digit historical dates, but the current renderer has important epoch and time-zone limits. Learn what it calculates and how to verify it.
May 12, 2026 · 6 min read
Do Star Maps Show the Moon and Planets?
Some star maps include solar-system objects, but OwnStarMap's current core poster does not. Learn what is plotted, why providers differ and how to verify a date.
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
The Astronomy Behind Holidays: Why Christmas Is December 25 and Easter Changes Date
Christmas falls near the winter solstice, Easter follows the first full moon of spring, and Valentine's Day is tied to the return of light. Here's how astronomy shaped our calendar.
April 10, 2026 · 9 min read