Here's why:

* Sunlight interference: During the day, the sun's light is too bright to see the faint light from distant stars.

* Darkness reveals stars: At night, with the sun below the horizon, the sky becomes dark enough for our eyes to pick up the light from stars, forming the patterns we know as constellations.

Best time to see constellations:

* New Moon: The absence of moonlight makes the sky exceptionally dark, allowing you to see even fainter stars.

* Away from city lights: Light pollution from cities washes out the stars. Head to a location with minimal light pollution for the best view.

* Clear weather: Clouds obscure the stars, so a clear night is essential.

Remember, the constellations you can see will depend on your location and the time of year. Some constellations are visible only during specific seasons.