Useful links

Astronomical Calendar - http://astrocalendar.50webs.com/sun.html

Sun - https://soho.nascom.nasa.gov/sunspots/

Time and Date - https://www.timeanddate.com/

National Astronomical Observatory "Rozhen" - https://nao-rozhen.org/index. html

Institute of Astronomy, BAS - https://www.astro.bas.bg/

THE MESSIER CATALOG - http://www.messier.seds.org/

Astronomical Picture of the Day - https://apod.nasa.gov/apod/

European Southern Observatory - https://www.eso.org/public/

NASA - https://www.nasa.gov/

ALMA - https://www.almaobservatory.org/en/home/

Spacex - https://www.spacex.com/

Regional History Museum - https://museumsmolyan.eu/

Art Gallery - https://artgallery-smolyan.com/

Information portal for Smolyan Municipality - https://www.smolyandnes.com/

Information portal for Smolyan and the region - https://smolyan.info/news