1958 – Pukapuka, Cook Islands in the Pacific This was a joint HAO – Sacramento Peak expedition that was unable to obtain a single photo due to rainstorms.

[5] 1991 - Mauna Loa, Hawaii HAO in collaboration with Rhodes College, Tennessee 1994 - Putre, Chile 1998 – Curaçao, Dutch Antilles[6] 2012 – Palm Cove, Queensland, Australia[7] 2017 - Preparing for the 2017 Eclipse[8] Walter Orr Roberts was a graduate student under Donald Menzel at Harvard, and helped him set up a solar telescope at the Oak Ridge Station of Harvard College Observatory.

Its sole purpose was to study the sun, using the first coronagraph in the western hemisphere.” [10] Walter Roberts and his wife arrived in the summer of 1940, and remained at the observatory for 7 years (throughout WWII and beyond).

At Climax, Walter Roberts quickly proved observationally what most astronomers had previously suspected, that the corona itself rotated with the same period as the solar surface, in something over twenty-five days.

He initiated a study of the fine structure of the solar atmosphere, determining the behavior of what he called “spicules,” a phenomenon that I had myself briefly discussed while at Lick Observatory.

In 1946, CU Boulder became a joint sponsor with Harvard of the observatory, while the Central Radio Propagation Laboratory (CRPL) of the NSB funded HAO's operational costs.