A substance that yields an anion plus a hydrogen ion is an acid.
An acid is a chemical substance often a liquid that gives a hydrogen ion (H+). Acids may either be strong or weak. Acids usually have a lower pH, and a sour taste. They react with bases and some metals such as calcium to produce salt. Acids turn blue litmus paper to red. Examples of acids are acetic acid, and hydrochloric acid.
A solar eclipse occurs when the moon gets between Earth and the sun, and the moon casts a shadow over Earth. A solar eclipse can only take place at the phase of new moon, when the moon passes directly between the sun and Earth and its shadows fall upon Earth's surface.