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2. House (astrology) - Wikipedia

   en.wikipedia.org/wiki/House_(astrology)

   Every house system is dependent on the rotational movement of Earth on its axis, but there is a wide range of approaches to calculating house divisions and different opinions among astrologers over which house system is most accurate. [3] To calculate the houses, it is necessary to know the exact time, date, and location.

3. Bhāva - Wikipedia

   en.wikipedia.org/wiki/Bhāva

   The modern Krishnamurti Paddhati also incorporates a Placidus house system. The principle of House Division introduced in Sripathi Bhāv System is described as follows: "In the Sripathi system the 1st house cusp is the Lagna, and the 7th house cusp is the Descendant opposite it, the 10th house cusp is at the MC (Medium Coeli or Madhya Lagna), i ...

4. Iron-oxidizing bacteria - Wikipedia

   en.wikipedia.org/wiki/Iron-oxidizing_bacteria

   The anoxygenic phototrophic iron oxidation was the first anaerobic metabolism to be described within the iron anaerobic oxidation metabolism. The photoferrotrophic bacteria use Fe 2+ as electron donor and the energy from light to assimilate CO 2 into biomass through the Calvin Benson-Bassam cycle (or rTCA cycle) in a neutrophilic environment (pH 5.5-7.2), producing Fe 3+ oxides as a waste ...

5. Sidereal and tropical astrology - Wikipedia

   en.wikipedia.org/wiki/Sidereal_and_tropical...

   v. t. e. In astrology, sidereal and tropical are terms that refer to two different systems of ecliptic coordinates used to divide the ecliptic into twelve "signs". Each sign is divided into 30 degrees, making a total of 360 degrees. [ 1] The terms sidereal and tropical may also refer to two different definitions of a year, applied in sidereal ...

6. Water filter - Wikipedia

   en.wikipedia.org/wiki/Water_filter

   A water filter removes impurities by lowering contamination of water using a fine physical barrier, a chemical process, or a biological process. Filters cleanse water to different extents, for purposes such as: providing agricultural irrigation, accessible drinking water, public and private aquariums, and the safe use of ponds and swimming pools .

7. History of water supply and sanitation - Wikipedia

   en.wikipedia.org/wiki/History_of_water_supply...

   The history of water supply and sanitation is one of a logistical challenge to provide clean water and sanitation systems since the dawn of civilization. Where water resources, infrastructure or sanitation systems were insufficient, diseases spread and people fell sick or died prematurely. Astronaut Jack Lousma taking a shower in space, 1974.