Terms of use
Sky of Your Day is free and will stay free. These few rules help keep it that way.
What you can do
Make, download and print as many posters and images as you like, without paying anything.
Use them yourself, hang them at home, give them as gifts, share them on social media or in a message.
Take the file to a print shop or an online printing service to have it printed.
The posters and images you make are released under the Creative Commons BY-SA 4.0 licence, the same as the star data they come from: you can use them, change them and even sell them, as long as you credit the source and share changed versions under the same licence.
What stays reserved
The Sky of Your Day name and brand, the code, the site design and the page texts: they may not be copied to build a similar service or used to suggest that a product comes from Sky of Your Day.
If you republish or sell a poster, keep the skyofyourday.com address and credit the data, as the licence requires: for example “Sky of Your Day (skyofyourday.com), star data HYG Database, CC BY-SA 4.0”.
Who owns what
The Sky of Your Day name, the code, the site design and the page texts belong to Sky of Your Day: all rights reserved.
Star positions and data come from the HYG Database (CC BY-SA 4.0), constellation figures from d3-celestial (BSD-3) and calculations from Astronomy Engine (MIT): they remain free under their own licences.
Accuracy
The sky is carefully calculated for the chosen date, time and place, but the site is provided as is, without warranty: data for some stars, especially less studied ones, may be incomplete.
Privacy
No cookies and no accounts. Your date of birth and place stay on your device.
When you search for a city, the name you type is sent to Open-Meteo to find its coordinates.
When you download a poster, the site adds 1 to the public count of maps made: it counts the download, not who made it.
Donations
Anyone who wants to can support the site with a voluntary donation. It unlocks nothing: everything stays free for everyone. Ko-fi
The donation form is Ko-fi’s and opens inside the page only if you choose to open it: until you do, the site does not contact Ko-fi and sends it nothing. Ko-fi