Astronomy Info & Events - April

Moon Phases

April 8: Last Quarter Moon

April 15: New Moon

April 22: First Quarter Moon

April 29: Full Moon (The Pink Moon)

Special Events

International Space Station (ISS) Observable Passes

ISS passes are visible from April 1 to about April 10 during the early evening.  Check out the website or by using satellite tracking smart phone apps like Sputnik to find out the exact times when the ISS will be visible from your location.  The ISS will be seen as a bright moving point of light, moving in an arc from the west to the east during its visible passes.

April 7: Mars and Saturn close conjunction at dawn.

April 9: Royal Astronomical Society of Canada (Edmonton Centre) meeting. Times:  7:30 p.m. – 9:30 p.m. in the IMAX Theatre at the TELUS World of Science. Free for anyone to attend.  See for more details.

April 12: Yuri’s Day, a celebration of Russian Cosmonaut Yuri Gagarin’s flight into space (first human space flight), April 12, 1961.

April 17: Thin waxing crescent Moon near Venus in the western sky after sunset.

April 21: International Astronomy Day!  Special programs around the TELUS World of Science – Edmonton and the RASC Observatory. See for more details.

April 22: Lyrid meteors peak

April 22: Earth Day. See for more information


Mercury is not visible this month as it will be at inferior conjunction with the Sun on April 1.

Venus continues to gain elevation and prominence in our western sky after sunset during the month.  You really can’t miss this bright beacon of light!  Look for a nice grouping of the slim waxing crescent Moon with Venus on the evening of April 17.

Mars is seen rising above the southeastern horizon around 4:00 a.m. local time (at the start of the month) and by 3:00 a.m. local time (by the end of the month).  It continues to moves eastward amongst the stars of the constellation of Sagittarius, the archer, through the month.  On April 2 watch Mars and Saturn have a very close conjunction as they approach within 1.3 degrees of one another.  During the pre-dawn hours of April 7 look for a nice grouping of Saturn and Mars with the waning gibbous Moon!  Mars continues to brighten in our morning sky as the distance between it and the Earth continues to decrease leading to the opposition of Mars in late July.

Jupiter is located in the constellation of Libra, the scales.  It now rises above the southeastern horizon before midnight and can be found low in the south-southwestern sky by sunrise.  During the late evening hours of April 2 until the pre-dawn hours of April 3, the waning gibbous Moon can be found just above Jupiter.

Saturn and Mars rise at approximately the same time and in the same part of the sky during the pre-dawn hours.  Both are located within the constellation of Sagittarius, the archer.  Saturn begins its retrograde motion on April 19.