A spectacular celestial event will unfold between March 25 and 28, where all seven planets of the solar system (excluding Earth) will align in the night sky after sunset. This rare planetary alignment can be observed clearly on March 28, marking a unique astronomical phenomenon that will not occur again until 2040, according to Professor Chandana Jayaratne, Head of the Department of Physics at the University of Colombo and Chairman of the Arthur C. Clarke Institute for Modern Technologies.
Best Time and Location for Viewing
Professor Jayaratne emphasizes that the best time for viewing is shortly after sunset, around 7:10 PM, as Mercury and Saturn will quickly set below the western horizon. To get an unobstructed view, observers should find an elevated location, such as a rooftop or hilltop, where the western horizon is clearly visible.
Since all planets follow a common path across the sky, drawing an imaginary line from west to east will help identify them easily.
How to Identify the Planets
Professor Jayaratne provides the following step-by-step guide to locating the planets:
- Start observing right after sunset by looking above the western horizon.
- Venus will be the brightest planet in the sky, making it the easiest to spot.
- Mercury and Saturn will appear slightly below Venus, closer to the horizon, and will disappear by 7:10 PM. Therefore, early observation is crucial.
- Drawing an imaginary line between Venus and Saturn will lead to Jupiter, which can be seen higher up in the sky.
- Mars will be visible further east, glowing with a distinct reddish hue.
Viewing Uranus and Neptune
While five planets will be visible to the naked eye, Uranus and Neptune require a telescope or binoculars:
- Neptune will appear bluish and can be found slightly below Venus.
- Uranus, with a pale blue-green hue, will be located between Jupiter and c.
Scientific Significance of the Event
This rare planetary alignment is scientifically significant because planets typically follow different orbits and do not often align in such a straight-line formation. The next opportunity to witness such an event will not occur until 2040, making this a once-in-a-lifetime experience for many stargazers.
Professor Jayaratne encourages schools, universities, and space enthusiasts to take advantage of this rare event to inspire interest in astronomy and space science. He also advises using telescopes or cameras for a clearer view, especially for spotting Neptune and Uranus.
Weather Considerations
For the best viewing experience, clear skies are essential. Fortunately, March 28 is expected to have minimal cloud cover, providing optimal conditions for observation in Sri Lanka.
Final Tips for Observing the Planetary Alignment
- Begin observation immediately after sunset to catch Mercury and Saturn before they set.
- Find a location with a clear view of the western horizon, such as a hilltop or rooftop.
- Use a telescope or binoculars for a better view of Uranus and Neptune.
- Check weather forecasts to ensure clear skies for the best visibility.
This extraordinary cosmic display presents a rare opportunity for astronomy enthusiasts and the general public to witness a once-in-a-generation planetary event. Don’t miss it!