Jigger (sand flea) infested foot. Tunga penetrans (chigoe flea or jigger) is a parasitic insect found in most tropical and sub-tropical climates. It is native to Central and South America, and has been inadvertently introduced by humans to sub-Saharan Africa. Synonyms for Tunga penetrans include Sarcopsylla penetrans, Pulex penetrates, and many others. In its parasitic phase it has significant impact on its host, which include humans and certain other mammalian species. A parasitical infestation of T. penetrans is called tungiasis.
According to data provided by the U.S. Navy Oceanography Portal (http://www.usno.navy.mil/USNO/as...), astronomical twilight lasts much longer (nearly 2 hours) during the summer compared to the winter months (only about 30-40 minutes).
A single day-night cycle lasts for 2 hours. It is broken into four stages: day, night, dawn and dusk. The sky appears fairly static during the day and night stages. During the day, the sky is bright and the sun is visible. During the night, the sky is dark, and stars and the moon are visible. During dusk and dawn, the sky smoothly transitions between the day and night appearances. The game considers dawn and dusk to be functionally day for the purposes of mechanics that only trigger during a specific part of the cycle.