The Large Zenith Telescope (LZT) was a 6.0-meter diameter liquid-mirror telescope located in the University of British Columbia's Malcolm Knapp Research Forest, about 70 km (43 mi) east from Vancouver, British Columbia, Canada (north from Maple Ridge).

While a zenith telescope has the disadvantage of not being able to look anywhere but at a small spot straight up, its simplified setup permits the use of a mirror consisting of a smoothly spinning pan filled with liquid mercury.

The LZT is used for transit imaging, meaning that Earth's rotation moves stars along the sensor, and the latent image in the sensor is moved electronically in step with this movement, so that it is read out at the trailing edge.

[1] According to Atlas Obscura the Large Zenith Telescope was decommissioned in the summer of 2016.

[citation needed] The website Physics Footnotes also mentioned that the LMT had been decommissioned, but gave no time frame in the undated article.