Obtaining the value to use for VLSR correction during analysis of amateur radio astronomy data from NRAO (Greenbank Observatory) website
https://www.gb.nrao.edu/cgi-bin/radvelcalc.py?UTDate=2026%2F04%2F11&UTTime=12%3A00%3A00&RA=20%3A23%3A00&DEC=40%3A00%3A00