A rare planetary triangle will form in the pre-dawn sky on April 28, with Venus and Saturn at its center. This celestial event occurs when two planets share the same right ascension, making them visible from Earth as a single point in the night sky.
Saturn and Venus will be separated by about 3.5 degrees in the sky, while Neptune, invisible to the naked eye, will sit just a few degrees away towards the horizon. To catch this event, stargazers need only find a clear view of the eastern horizon and look eastward before sunrise on April 28.
Venus will be visible as a bright morning star near the horizon, while Saturn will appear slightly dimmer to the bottom left. Neptune can be spotted with binoculars or a telescope, appearing as a small blueish-green point of light below and slightly to the left of Venus.
Mercury will also be present in the hour before dawn but will quickly disappear behind the rising sun. This rare planetary triangle offers a unique opportunity for stargazers to witness three planets aligning in the pre-dawn sky.
Source: https://www.space.com/stargazing/faint-neptune-joins-venus-and-saturn-to-form-a-planetary-triangle-in-the-pre-dawn-sky-on-april-28