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The Roman period gives us some of the terminology we use for summer. For instance, the expression "dog days of summer" comes from the ancient Latin phrase that referred to the star Sirius, which is the brightest star in the night sky and is part of the Canis Major (Greater Dog) constellation. This star would rise high during mid-July to late August, which is the period referred to as the dog days of summer, where the rising of the dog star was considered responsible for bringing stifling heat in the summer. Many people simply went to the frigidarium, or a cold or cool pool in bath houses found in most Roman cities. These pools would sometimes be cooled using ice brought in from the mountains and stored in underground shelters that kept ice from melting in the summer months. Some Roman houses have been found to have a system of pipes taht would circulate cold water around the walls, with the pipes inside the outer wall, to help keep the walls cool and the entire house feeling colder. The opposite, which was circulating warm water, would be done in winter.
==Later TechnologiesDevelopments==
By the 18th and early 19th century, several innovations began to develop. One was streets began to have more awnings installed so that more shade would be available. By the mid-19th century, heavy curtains began to become fashionable in homes as well as high ceilings, although these were already evident in some early Medieval homes and palaces. The curtains would block out sun light from coming into the house during the day, while high ceilings would allow the heat to move higher up and away from the occupants in a room. In the Victorian period, house plants also became popular, which helped to reduce air temperature in homes when plants released moisture. It was during this time also that public parks became popular, which were green spaces that also were relatively cooler than other built-up areas of urban areas. These became places people would flock to during the summer to relax.
==The Rise of Modern Cooling==
