1. Selected UBVRI Photometric Standard Stars from Landolt 1992, AJ, 104, 340
   https://www.wiyn.org/Observe/Landolt/

2. Sloan Digital Sky Survey
   http://cas.sdss.org/

3. NASA SkyView
   http://skyview.gsfc.nasa.gov/

4. CDS (Centre de Donne'es astronomiques de Strasbourg)
   http://simbad.u-strasbg.fr/simbad/
   http://vizier.u-strasbg.fr/viz-bin/VizieR
   

5. AAVSO
   http://www.aavso.org/

6. Find Exoplanet Transits
   https://astro.swarthmore.edu/transits/transits.cgi

7. RHO: Eclipsing Binary Ephemeris Generator
   http://www.rollinghillsobs.org/perl/calcEBephem.pl

8. xephem Reference Manual
   http://www.clearskyinstitute.com/xephem/help/xephem.html

9. Aladin User Manual
   https://aladin.u-strasbg.fr/java/AladinManualV11.pdf

10. Fourmi Lab:Your Sky
    http://www.fourmilab.to/yoursky/

Where we are: Longitude: 94° 23.782' , latitude: 45° 34.498', altitude: 1210 ft.