The alternate rising and falling of the sea, usually twice in each lunar day at a particular place, due to the attraction of the moon and sun.

An obscuring of the light from one celestial body by the passage of another between it and the observer or between it and its source of illumination.

each of the four divisions of the year (spring, summer, autumn, and winter) marked by particular weather patterns and daylight hours, resulting from the earth's changing position with regard to the sun.

drift with or as if with the tide.