Denmark the 22 proposals have been agreed upon by a parliamentary majority. Denmark shares strong cultural and historic ties with its Scandinavian neighbours Sweden and Norway. It has historically been one of the most socially progressive cultures in the world. In 1969, Denmark was the first country to legalise pornography, and in 2012, Denmark replaced its "registered partnership" laws, which it had been the first country to introduce in 1989, with gender-neutral marriage. Modesty and social equality are important parts of Danish culture. The astronomical discoveries of Tycho Brahe (1546–1601), Ludwig A. Colding's (1815–88) neglected articulation of the principle of conservation
International Planetary Patrol Program International Planetary Patrol Program The NASA International Planetary Patrol Program consists of a network of astronomical observatories to collect uninterrupted images and observations of the large-scale atmospheric and surface features of the planets. This group was established in 1969, and consisted of the Mauna Kea Observatory, the Mount Stromlo Observatory, the Perth Observatory, the Republic Observatory, the Cerro Tololo Inter-American Observatory, the Magdalena Peak Station of the New Mexico State University, and the Lowell Observatory. The activities were coordinated by William A. Baum of Lowell Observatory. For Mars, they monitored clouds and dust storms, as well as the seasonal fluctuations