Here is a list of astronomical events for given month. Location dependent events listed here are visible from central Europe.
April 2015:
4 – Full moon at 12 UT.
4 – Conjunction of planets Mercury and Uranus At 11UT they are separated ~0.5 degrees.
5 – Uranus at solar conjunction, not observable.
6 – Comet C/2012 F3 (PANSTARRS) at perihelion, not very bright, it may reach magnitude +13.
18 – New moon.
19 – Mercury at superior solar conjunction at ~03UT.
22 – The Lyrid meteors peak at 24:00 UT with a ZHR of 18.
22 – Moon passes 0.1 degrees North of asteroid Juno.
RECENT STELLAR EVENTS::
Sn 2015f or PSN J07361576-6930230 Supernovae in NGC 2442 .
Nova Sagittarii 2015 No. 2 or PNV J18365700-2855420 Nova in constellation Sagittarius.
Nova Oph 2015 or PNV J17291350-1846120 Nova in constellation Ophicious.