Robert H. Gray could refer to various individuals, as it is a relatively common name. If you are looking for a specific Robert H. Gray, it would be helpful to provide more context, such as their profession or notable achievements. For instance, he might be an author, scientist, academic, or involved in some other field.

Robert Holmes is an astronomer noted for his contributions to the field of astronomy, particularly in relation to the study of celestial bodies and their movements. However, detailed information about a specific Robert Holmes as an astronomer is limited, and there may be multiple individuals with that name involved in different aspects of astronomy or related fields.

Rogelio Bernal Andreo is a Spanish astrophotographer known for his stunning images of the night sky, particularly those involving deep-sky objects such as galaxies, nebulae, and star clusters. He has gained recognition for his ability to blend technical skill with artistic vision, capturing celestial phenomena in breathtaking detail. His work often involves advanced techniques in astrophotography, including long exposures and the use of specialized equipment.

Sarah Elizabeth Whitin does not appear to be a widely recognized public figure or concept based on the information available up to October 2023.

In law, ambiguity refers to a situation where a legal document, such as a statute, contract, or will, contains language that can be interpreted in more than one way. This uncertainty can arise from unclear definitions, vague terms, or conflicting provisions within the document. Ambiguity is significant because it can lead to disputes between parties regarding their rights and obligations under the law. Courts often have to interpret ambiguous provisions to determine the intent of the parties involved.

"Seven Types of Ambiguity" is a book by the author and critic William Empson, first published in 1930. Empson's work is a critical examination of poetic language and ambiguity in literature. In the book, he identifies and analyzes seven distinct ways in which ambiguity can manifest in poetry and prose. His insights into these types of ambiguity are explained through the analysis of various literary texts.

Terence Dickinson is a well-known Canadian astronomer and writer, celebrated for his work in popularizing astronomy. Born on June 27, 1934, he has authored numerous books and guides aimed at helping amateur astronomers understand the night sky. His publications often include practical advice on stargazing, telescope use, and the science behind celestial events. Dickinson has also contributed significantly to the field through his involvement in planetarium shows, magazine articles, and television programs.

William Radcliffe Birt (1781-1862) was a British astronomer notable for his contributions to the study of the Moon. Alongside his work in astronomy, he also made significant observations and calculations related to various celestial phenomena. Birt is particularly known for his studies of the lunar surface and for creating detailed maps and drawings of the Moon, which aided in the understanding of its topography and geological features.

William Tyler Olcott (1859–1932) was an American astronomer and author known for his contributions to the field of astronomy, particularly in popularizing the subject through his writings. He wrote extensively on various astronomical topics, including celestial navigation, star lore, and practical astronomy. Olcott is perhaps best known for his works aimed at amateur astronomers and educational institutions, helping to make astronomy accessible to a broader audience.

Yuji Hyakutake (百武 裕司) is a Japanese astronomer and amateur comet discoverer, notable for his discovery of the comet C/1996 B2 (Hyakutake) in January 1996. This comet gained significant attention due to its brightness and close approach to Earth, becoming one of the brightest comets in the late 20th century.

Walter Frederick Gale was an Australian inventor and businessman, best known for his work in the early 20th century on developing and promoting a type of rotary engine known as the Gale engine. He gained some attention for his innovative designs and attempts to create efficient energy solutions. His inventions included various mechanisms intended to improve engine performance, including a unique carburetor design. Gale is also known for his involvement in the promotion of alternative energy sources and for his contributions to the field of engineering.

Walter Scott Houston (1912-1993) was an influential American astronomer, known particularly for his work in the field of amateur astronomy and for his contributions to astronomy education. He was a longtime editor of the "Sky and Telescope" magazine and authored numerous articles, helping to popularize astronomy among enthusiasts and the general public. Houston was also known for his observational astronomy skills and for engaging in practical astronomy projects, making significant contributions to the understanding of various celestial phenomena.

Amber is a fossilized tree resin that comes in a variety of types, each with unique characteristics. Here are some notable types of amber: 1. **Baltic Amber**: One of the most well-known types, found in the Baltic region, primarily in countries like Lithuania, Latvia, and Poland. It often contains inclusions such as insects.

Oise amber refers to amber that is found in the Oise department of northern France, particularly known for its significant deposits of fossilized tree resin. This type of amber is notable for its age, often dating back to the Late Cretaceous period, and is prized for its clarity, color, and the inclusion of prehistoric plant and insect materials.

Edward W. Yu is a prominent figure in the field of applied physics and materials science. He is known for his work in areas such as nanotechnology, semiconductor devices, and electronic materials. His research often focuses on the development and characterization of new materials for electronics and energy applications.

The Harvard University Department of Mathematics boasts a distinguished faculty known for their contributions to various fields of mathematics. The department includes a mix of professors, associate professors, and assistant professors specializing in areas such as algebra, geometry, analysis, topology, mathematical logic, and applied mathematics, among others. Faculty members are often engaged in significant research, publish in academic journals, and contribute to mathematical education.

Mexican amber is a type of fossilized tree resin that is found predominantly in Mexico, particularly in the Chiapas region. It is known for its vibrant golden-yellow to deep orange and brown hues and is valued for its beauty and unique inclusions, such as ancient insects, plants, and other organic materials that have been trapped in the resin over millions of years. The amber from Mexico is estimated to be around 20 to 30 million years old, dating back to the Miocene epoch.

Spanish amber, often referred to as "Copal," is a type of amber that originates primarily from the region of Spain, particularly the area around the city of the same name in the Basque Country. Amber itself is a fossilized tree resin, prized for its color, clarity, and the occasional inclusion of ancient trapped organisms, such as insects or plant material.

Taimyr amber is a type of amber that is found in the Taimyr Peninsula in northern Siberia, Russia. It is notable for its age, with estimates suggesting that it dates back to the Late Cretaceous period, around 75 to 100 million years ago. Taimyr amber is typically characterized by its rich color variations, which can include shades of yellow, orange, and even deep reddish hues.

"Argiles d'lignite du Soissonnais" refers to a specific type of clay found in the Soissonnais region of France, which is notable for its lignite deposits. Lignite, also known as brown coal, is a type of coal that is intermediate in carbon content and energy output between peat and higher-grade coals.