It is necessary to use a browser connected to the Internet, be it a mobile phone, a computer or a tablet and accept to share the location.
The following conditions must be met:
In the top menu bar, click on the icon "NightTime" and allow a minimum of 15 minutes for the visual capacity to adapt to the night. This is the so-called visual adaptation process.
In the top menu bar click on the "Measure" menu option and press Magnitude + / -
You have to look north. If you do not know which direction it is, use any compass or GPS application.
Click on Magnitude + / - so that the map in the box looks more like the observed sky.
You can use Rotate + / - and Zoom + / - to facilitate the search.
Remember that the zoom must be 100% to measure.
Once the measurement is complete, click on the "Save" button.