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Astronomy with an online telescope
Astronomy with an online telescope

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References

Frommert, H. and Kronberg, C. (2006) ) ‘Timeline of Charles Messier’, seds.org [Online]. Available athttp://www.messier.seds.org/xtra/history/timeline.html (Accessed 12 March 2019).
Frommert, H. and Kronberg, C. (2006) ‘Charles Messier’s Comets’, seds.org [Online]. Available at http://www.messier.seds.org/xtra/history/m-comets.html.Accessed 12 March 2019).
Frommert, H. and Kronberg, C. (2006) ‘List of The Messier Objects Catalog’, seds.org [Online]. Available at http://www.messier.seds.org/. (Accessed 12 March 2019).
Frommert, H. and Kronberg, C. (2006) ‘Twelve Months Tour of the Messier Catalog’, seds.org [Online]. Available at http://www.messier.seds.org/xtra/12months/12months.html (Accessed 12 March 2019).
Bonnell, J. and Nemiroff, R. (2018) ‘Astronomy Picture of the Day Index – Messier Objects’, www.nasa.gov [Online]. Available at https://apod.nasa.gov/apod/messier.html (Accessed 12 March 2019).
Garner, R. (2019) ‘Hubble’s Messier Catalog’, www.nasa.gov [Online]. Available at https://www.nasa.gov/content/goddard/hubble-s-messier-catalog (Accessed 12 March 2019).