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2. Standard ruler - Wikipedia

   en.wikipedia.org/wiki/Standard_ruler

   A standard ruler is an astronomical object for which the actual physical size is known. By measuring its angular size in the sky, one can use simple trigonometry to determine its distance from Earth. In simple terms, this is because objects of a fixed size appear smaller the further away they are.

3. Ruler - Wikipedia

   en.wikipedia.org/wiki/Ruler

   A variety of rulers A carpenter's rule Retractable flexible rule or tape measure A closeup of a steel ruler A ruler in combination with a letter scale. A ruler, sometimes called a rule, scale or a line gauge or metre/meter stick, is an instrument used to make length measurements, whereby a length is read from a series of markings called "rules" along an edge of the device. [1]

4. Cosmic distance ladder - Wikipedia

   en.wikipedia.org/wiki/Cosmic_distance_ladder

   Another class of physical distance indicator is the standard ruler. In 2008, galaxy diameters have been proposed as a possible standard ruler for cosmological parameter determination. [26] More recently the physical scale imprinted by baryon acoustic oscillations (BAO) in the early universe has been used.

5. Baryon acoustic oscillations - Wikipedia

   en.wikipedia.org/wiki/Baryon_acoustic_oscillations

   The length of this standard ruler (≈490 million light years in today's universe [3]) can be measured by looking at the large scale structure of matter using astronomical surveys. [3] BAO measurements help cosmologists understand more about the nature of dark energy (which causes the accelerating expansion of the universe ) by constraining ...

6. Metre-stick - Wikipedia

   en.wikipedia.org/wiki/Metre-stick

   A metrestick divided into 1,000 mm and labeled with 100 cm. A metre-stick, metrestick (or meter-stick and meterstick as alternative spellings); [1] or yardstick [2] is either a straightedge or foldable ruler used to measure length, and is especially common in the construction industry.

7. Length measurement - Wikipedia

   en.wikipedia.org/wiki/Length_measurement

   The ruler the simplest kind of length measurement tool: lengths are defined by printed marks or engravings on a stick. The metre was initially defined using a ruler before more accurate methods became available. Gauge blocks are a common method for precise measurement or calibration of measurement tools.