What does ATH stand for?

Above the Horizon

This definition appears very rarely and is found in the following Acronym Finder categories:

Military and Government

Other Resources:

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Samples in periodicals archive:

In the morning sky, the Orion constellation will be fairly high above the horizon.

Watch out for celestial shower

30[degrees] east of north, and disappeared 8[degrees] above the horizon.

Southern African Fireball Observations 2007/8: T P Cooper (Director, ...

6') can be a fine sight from southern Spain and from the Canary Islands, culminating around 15[degrees] above the horizon.

Two great globular clusters--north versus south

During its three-month prime mission, the sun stayed above the horizon, allowing the long-armed lander to dig trenches in the soil and collect ice bits for its various instruments to analyze.

United States: NASA regains contact with Mars spacecraft

During its three-month prime mission, the sun stayed above the horizon, allowing the long-armed lander to dig trenches in the soil and collect ice bits for its various instruments to analyze.

NASA regains contact with Mars spacecraft

In the far north, the sun does not set for around 10 weeks during summer, while in winter it does not rise above the horizon for nearly eight weeks.

Finland's firearms epidemic

Also, by laying down at ground level, he placed the dandelion above the horizon line so the sunlight filters through.

Pix From My Weekend

Lunar eclipses are visible wherever the Moon is above the horizon.

Ready the telescopes: partial lunar eclipse on Saturday