An unusual gathering of three planets can be viewed low in the southwestern sky soon after sunset. Jupiter, Saturn and Mercury are forming a tight triangle.

For weeks we've been watching as Jupiter gradually pulls away from the ringed planet Saturn. Seeing the two has been a challenge, as both are close to the southwestern horizon. Then they set.

Planet gazing gets a little more interesting next week, as Mercury appears right beneath the two others.

The planets Jupiter and Saturn continue to appear close together.

The planets Jupiter and Saturn are in conjunction.

The best meteor shower of the year takes place Sunday night.

The two largest planets in the solar system are easy to find low in the southwestern sky after sunset.

The two largest planets in the solar system are about to appear quite close.

The moon and Mars will be together on Wednesday evening, the evening before Thanksgiving.

A relatively small meteor shower, the Leonids takes place on the evening of Monday, Nov. 16 and into the early morning of the next day.

Venus is the easiest and brightest planet to spot high in the east in the morning.

Tomorrow we have a Blue Moon, a full moon. While there is no color change, the name of a color refers more to its rarity. You won’t see anything unusual when you look up this weekend.

A Blue Moon occurs on the second full moon of a month. We had a full moon at the start of October and this one comes on the last day of the month Halloween. What is truly rare is that this one falls on Halloween night, when little gobblins and witches are roaming. In fact, if you do the math every time the moon is full on Halloween Night, it is a Blue Moon.