Angeles Duran, 49, from Vigo in the north-western region of Galicia, applied for ownership of the Sun after learning that similar claims had been made by an American on the Moon, Mars and Venus.
Although the Outer Space Treaty of 1967 prevents any government from staking their claim over celestial bodies it does not extend to private individuals, an opinion backed by her notary after consulting legal bodies in Spain.
Last week Miss Duran was issued with a document that declares she is "the owner of the Sun, a star of spectral type G2, located in the centre of the solar system, at an averaged distance from Earth of around 149,600,000 kilometres" (93 million miles).
She now plans to profit from her property and wants to charge those whose benefit from its energy and claims to have met representatives from Spain's Ministry of Industry to discuss levying a fee on photovoltaic plants for converting the sun's energy into electricity.
"When you have a property it makes sense to make use of it. Power companies profit from the rivers which belong to everyone so I hope to take advantage of the sun."
Miss Duran has come up with a plan that will distribute profits made from the Sun across Spain with half the proceeds going to the government, 20 per cent to the nation's pension fund, 10 per cent dedicated to ending world hunger and ten per cent on research. She says she will keep 10 per cent of the earnings from the Sun for herself.