* Astronomy

The Tartu Old Observatory was founded on the 27th April 1811
http://astronomy.activeboard.com/t42525530/tartu-observatory/

First light of the Anglo-Australian Telescope occurred on 27 April 1974.
http://en.wikipedia.org/wiki/Anglo-Australian_Telescope

Valeri Vladimirovich Polyakov (April 27, 1942) is a Russian former cosmonaut.
http://en.wikipedia.org/wiki/Valeri_Polyakov

Ellen Louise Shulman Baker (born April 27, 1953) is an American physician and a NASA astronaut. 
http://en.wikipedia.org/wiki/Ellen_Louise_Shulman_Baker

Sheila Scott (27 April 1922 - 20 October 1988), was an English aviatrix.
http://astronomy.activeboard.com/t53495792/sheila-scott-obe-1922-1988/

Samuel Finley Breese Morse (April 27, 1791 - April 2, 1872) was an American inventor. 
http://en.wikipedia.org/wiki/Samuel_Morse

Michael Fish (born 27 April 1944) is a semi-retired British weather forecaster
http://astronomy.activeboard.com/t48903554/michael-fish-mbe/

William Myron Keck (April 27, 1880 - August 20, 1964) was an American oil entrepreneur and philanthropist
http://en.wikipedia.org/wiki/William_Myron_Keck

Mumtaz Mahal (27 April 1593 - 17 June 1631) was a Mughal Empress and chief consort of emperor Shah Jahan.
https://en.wikipedia.org/wiki/Mumtaz_Mahal

Philip Hauge Abelson (April 27, 1913 - August 1, 2004) was an American physicist
http://astronomy.activeboard.com/t48903550/philip-abelson-1913-2004/

NGC 3306 (also IRAS 10345+1254, MCG 2-27-32, UGC 5774 and PGC 31528) is a magnitude +13.4 barred spiral galaxy located 133 million light-years away in the constellation Leo.
The galaxy was discovered by American astronomer Lewis A. Swift using a 40.64 cm (16 inch) refractor at the Warner Observatory, Rochester, New York on the 27th April 1886.
http://astronomy.activeboard.com/t57405064/ngc-3306/

NGC 3569 (also MCG 6-25-20, UGC 6238 and PGC 34075) is a magnitude +13.3 face-on spiral galaxy located 343 million light-years away in the constellation Ursa Major.
The galaxy was discovered by German-Danish astronomer Heinrich Louis d'Arrest using a 27.94 cm (11 inch) f/17.5 refractor at the Copenhagen Observatory on the 27th April 1864.
http://astronomy.activeboard.com/t57405058/ngc-3569/

NGC 3792 is a magnitude +13.4 double star located in the constellation Virgo.
The star was discovered by American astronomer Edward Singleton Holden using a 39.62 cm (15.6 inch) f/15.6 Clark-refractor at the Washburn Observatory on the 27th April 1881.
http://astronomy.activeboard.com/t57405054/ngc-3792/

NGC 3843 (also MCG 1-30-11, UGC 6699 and PGC 36471) is a magnitude +13.5 spiral galaxy located 271 million light-years away in the constellation Virgo.
The galaxy was discovered by American astronomer Edward Singleton Holden using a 39.6 cm (15.6 inch) f/15.6 Clark-refractor at the Washburn Observatory on the 27th April 1881.
http://astronomy.activeboard.com/t57405045/ngc-3843/

NGC 3927 is a non-existent object in the constellation Leo.
The object was discovered by German-Danish astronomer Heinrich Louis d'Arrest using a 27.94 cm (11 inch) f/17.5 refractor at the Copenhagen Observatory on the 27th April 1864.
http://astronomy.activeboard.com/t57405043/ngc-3927/

NGC 3943 (also MCG 4-28-84 and PGC 37237) is a magnitude +13.4 face-on spiral galaxy located 300 million light-years away in the constellation Leo.
The galaxy was discovered by German-Danish astronomer Heinrich Louis d'Arrest using a 27.94 cm (11 inch) f/17.5 refractor at the Copenhagen Observatory on the 27th April 1865.
http://astronomy.activeboard.com/t57405038/ngc-3943/

NGC 4336 (also IC 3254, MCG 3-32-20, UGC 7462 and PGC 40231) is a magnitude +12.5 spiral galaxy located 47 million light-years away in the constellation Coma Berenices.
The galaxy was discovered by German-British astronomer William Herschel using a 47.5 cm (18.7 inch) f/13 speculum reflector at Datchet, Berkshire, on the 27th April 1785.
http://astronomy.activeboard.com/t57405035/ngc-4336/

NGC 4544 (also MCG 1-32-110, UGC 7756 and PGC 41958) is a magnitude +13.0 edge-on spiral galaxy located 53 million light-years away in the constellation Virgo.
The galaxy was discovered by American astronomer Edward Doane Swift using a 40.64 cm (16 inch) refractor at the Warner Observatory, Rochester, New York on the 27th April 1887.
http://astronomy.activeboard.com/t57405025/ngc-4544/

NGC 4576 (also MCG 1-32-116, UGC 7792 and PGC 42152) is a magnitude +13.5 face-on barred spiral galaxy located 247 million light-years away in the constellation Virgo.
The galaxy was discovered by American astronomer Edward Singleton Holden using a 39.6 cm (15.6 inch) f/15.6 Clark-refractor at the Washburn Observatory on the 27th April 1881.
http://astronomy.activeboard.com/t57405017/ngc-4576/

NGC 5002 (also MCG 6-29-51, UGC 8254 and PGC 45728) is a magnitude +13.8 barred spiral galaxy located 840 million light-years away in the constellation Canes Venatici.
The galaxy was discovered by German-Danish astronomer Heinrich Louis d'Arrest using a 27.94 cm (11 inch) f/17.5 refractor at the Copenhagen Observatory on the 27th April 1865.
http://astronomy.activeboard.com/t57405012/ngc-5002/

NGC 5080 (also MCG 2-34-7 and PGC 46440) is a magnitude +13.6 elliptical galaxy located 300 million light-years away in the constellation Virgo.
The galaxy was discovered by American astronomer Edward Singleton Holden using a 39.6 cm (15.6 inch) f/15.6 Clark-refractor at the Washburn Observatory on the 27th April 1881.
http://astronomy.activeboard.com/t57405006/ngc-5080/

NGC 5259 (also NGC 5259-1, MCG 5-32-52 and PGC 48292) is a magnitude +14.2 elliptical galaxy located 840 million light-years away in the constellation Canes Venatici.
The galaxy was discovered by German-Danish astronomer Heinrich Louis d'Arrest using a 27.94 cm (11 inch) f/17.5 refractor at the Copenhagen Observatory on the 27th April 1865.
http://astronomy.activeboard.com/t57405004/ngc-5259/

NGC 5725 (also IRAS 14384+0224, MCG 0-37-25, UGC 9466 and PGC 52456) is a magnitude +13.7 barred spiral galaxy located 75 million light-years away in the constellation Virgo.
The galaxy was discovered by German-Danish astronomer Heinrich Louis d'Arrest using a 27.94 cm (11 inch) f/17.5 refractor at the Copenhagen Observatory on the 27th April 1862.
http://astronomy.activeboard.com/t57404999/ngc-5725/

NGC 5769 (also MCG 1-38-8 and PGC 53145) is a magnitude +14.1 spiral galaxy located 488 million light-years away in the constellation Boötes.
The galaxy was discovered by American astronomer Edward Singleton Holden using a 39.6 cm (15.6 inch) f/15.6 Clark-refractor at the Washburn Observatory on the 27th April 1881.
http://astronomy.activeboard.com/t57404996/ngc-5769/

NGC 5776 (also MCG 1-38-18 and PGC 53289) is a magnitude +14.4 elliptical galaxy located 376 million light-years away in the constellation Virgo.
The galaxy was discovered by German-Danish astronomer Heinrich Louis d'Arrest using a 27.94 cm (11 inch) f/17.5 refractor at the Copenhagen Observatory on the 27th April 1862.
http://astronomy.activeboard.com/t57404993/ngc-5776/

NGC 5857 (also MCG 3-39-4, UGC 9724 and PGC 53995) is a magnitude +13.1 barred spiral galaxy located 219 million light-years away in the constellation Boötes.
The galaxy is close to the galaxy NGC 5859.
The galaxy was discovered by German-British astronomer William Herschel using a 47.5 cm (18.7 inch) f/13 speculum reflector at Windsor Road, Slough, on the 27th April 1788.
http://astronomy.activeboard.com/t57404988/ngc-5857/