Milwaukee Astronomical Society

Astronomy is our hobby! Dedicated to the fun of astronomy at all levels from beginner to expert, casual viewing to scientific research. We welcome everyone interested in astronomy. Find out more about us.

MAS General Meetings
Our next General meeting will be on April 21st.
7pm at the UWM Planetarium.

Public Open House
Our next open house will be May 9th, Friday.

Our New Website!!
Be sure to look around as we continue to add to our website. Be sure to checkout becoming a member, the beginner's guide section, and the image gallery of pictures taken by our own members!

MAS Observatory occupies 3 acres at 18850 W Observatory Rd in New Berlin, WI  53146

View the Observatory & Grounds

Open House Nights for 2025

We are pleased to announce we have established an Open House schedule for this year.

May 9, 2025, 7:00-10:00PM

June 14, 2025, 1:00-4:00PM

July 19, 2025, 1:00-4:00PM

August 8, 2025, 6:30-9:30PM

September 26, 2025, 6:30-9:30PM

October 24, 2025, 6:00-9:00PM

Click/Tap here to sign up for our email reminders of upcoming Open House nights.




S&T: This Weeks Sky At A Glance

Astronomy Magazine: The Sky This Week

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Membership Information
Application Information
MAS Bylaws
Our New MAS Members

Membership Info
Application Info
MAS Bylaws
Our New Members

Membership Information
Application Information
MAS Bylaws
Our New MAS Members

What's New Solar Lunar Planets Globular Open

Nebulae Galaxies Planetary Comets Wide Field Other

Sky Chart
Solar Activity
Artificial Satellites
Meteor Showers
Lunar Phases
Dark Observing Sites

For Members Page
Member Login
Renew Membership

Stargazing Spring Sky Tour Summer Sky Tour Autumn Sky Tour

Winter Sky Tour Constellations The Sky by Eye Star Hopping

Stargazing Spring Sky Summer Sky Autumn Sky

Winter Sky Constellations Sky by Eye Star Hopping

Stargazing Spring Sky Tour Summer Sky Tour Autumn Sky Tour

Winter Sky Tour Constellations The Sky by Eye Star Hopping

Beginner's Guide Getting Started Stellarium Asterisms Celestial Sphere Telescopes

Using Telescope Solar System Deep Space Objects Double Stars Star Hopping Day and Time

Beg Guide Get Started Stellarium Asterisms Cel Sphere Telescopes

Using Telescope  Solar System  DSOs  Double Stars  Star Hopping  Day and Time

Beginner's Guide Getting Started Stellarium Asterisms Celestial Sphere Telescopes

Using Telescope Solar System Deep Space Objects Double Stars Star Hopping Day and Time

MAS History Members Awards A-Scope Log Books 1932-39 1940-49

1950-59 1960-69 1970-79 1980-89 1990-99 2000-09 2010-19

Z UMa Project
Julian Date Conversion
EB Ephemeris
RR Lyrae Ephemeris

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