Naibei 0 ~ 20 degree belt in the sky, stars 18 to 19.5 degrees. SELECT STARID, RA, DEC, Blue_mag from stars where dec Between 32400000 and 39600000 and blue_mag> = 18 and blue_mag <= 19.5;
Ascension number of coordinates of the target range Usno 0 ~ 60 0 ~ 60 ~ 12021600000 216,000,001,067,863 432,000,005,846,500 120 ~ ~ ~ 648,000,001,505,055 18043200000 24064800000 ~ 180 ~ 240 to 864,000,001,456,496 30086400000 13453555300 ~ ~ 108 000 000 360 108 000 000 ~ 1,296,000,004,958,824
Total: 28288293 Naeishi 0 ~ 20 degree belt-shaped area, star is 18 to 18.5 degrees. SELECT STARID, RA, DEC, Blue_mag from stars where dec betWeen 32400000 and 39600000 and blue_mag> = 18 and blue_mag <= 18.5; total: 7668638
