No, the Northern Lights (Aurora Borealis) don't come once a year. They are a regular phenomenon that can be seen throughout the year, though with varying intensity and frequency.

Here's why:

* Solar activity: The Aurora Borealis is caused by charged particles from the sun interacting with the Earth's atmosphere. These solar storms occur regularly and are the primary driver of the Northern Lights.

* Seasons and darkness: While the aurora can happen any time of year, it's most visible during the winter months when there are long periods of darkness.

* Location: The best places to see the Northern Lights are in the high latitude regions close to the Earth's magnetic poles, like Alaska, Canada, Greenland, Iceland, Norway, Sweden, and Finland.

Therefore, the Northern Lights are not a seasonal event but a continuous occurrence, dependent on solar activity and visible in certain locations at various times of year.