No location selected. Click on the map to select a spot, then press "Stargaze!".
Click anywhere on the map to select a spot where you are interested in stargazing. Press the "Stargaze!" button, and a forcast for stargazing conditions will appear in this sidebar.
The color-coded map uses an expanded version of the Bortle Scale, which measures Light Pollution on a scale of 1-9. The Light Pollution Multiplier (LPX) is given in terms of multiples of additional brightness from a natural dark sky, where 0 is no additional brightness (perfect dark sky), and inner cities have skies over 40x brighter than natural.
Note that Light Pollution measurements are regional estimations based on satellite data taken in 2016, and may not fully reflect the real conditions.
|Extremely Dark||.01 - .06||2|
|Very Dark||.06 - .11||2|
|Dark||.11 - .19||3|
|Dark with Low LP||.19 - .33||3|
|Low LP||.33 - .58||4|
|Moderate-Low LP||.58 - 1||4|
|Moderate LP||1 - 1.7||5|
|Moderate LP||1.7 - 3||5|
|Moderate-High LP||3 - 5.2||6|
|Moderate-High LP||5.2 - 9||6|
|High LP||9 - 15.6||7|
|Very High LP||15.6 - 27||7|
|Extremely High LP||27 - 46.8||8|
|Extremely High LP||46.8+||9|
The Clear Sky Chart gives astronomical seeing conditions at a glance. Each chart has an abridged version (shown above) and a full version, which can be seen on clicking on an abridged chart. They can be hard to read, but as a rule of thumb, dark blue is good, and white/gray is bad, with the Rows "Cloud Cover" and "Transparancy" on the full chart being most important. A complete guide to reading them can be found here .
Stargazr begain as a project at Science Hack Day 2016 S, where a team of 8 threw together a quick and dirty webapp to combine weather and light pollution data.
It was inspired by a trip to watch the Persid Meteor Shower during which I did extensive planning to find the best time and place to go stargazing, but after consulting six different websites to check for weather, light pollution, driving distance, and more... a full moon washed out the view of most of the meteors - something that I had neglected to check for.
This (Stargazr 2.0) is a more up-to-date, accurate, and functional version of that app.
This project would not be possible without the existance of the following sites, datasets, and services
Stargzr v2 is largely the work of Brian Castro
The Original Stargzr Team consists of:
Something may go here later