Triple

Given a phrase, classify it is english named entity (e.g., persons, organizations, works of art) in Latin script, or not (e.g., literals, dates, URLs, verbose phrases). For disambiguation, the statement where the phrase occurs as object is also given. Please return a JSON object with `phrase` (string, the phrase being analyzed) and `is_ne` (boolean, indicating whether the phrase is a Named Entity).

Phrase: IAU 1991 resolutions on reference systems | Statement: [IAU 2006 resolutions, relatedTo, IAU 1991 resolutions on reference systems]

Target entity: IAU 1991 resolutions on reference systems
Context triple: [IAU 2006 resolutions, relatedTo, IAU 1991 resolutions on reference systems]

• A. International Celestial Reference System
  The International Celestial Reference System is the standard, high-precision coordinate framework used in astronomy and geodesy to define positions of celestial objects relative to distant quasars.
• B. IAU 1976 system of astronomical constants
  The IAU 1976 system of astronomical constants is a standardized set of numerical values and definitions adopted by the International Astronomical Union to ensure consistency in celestial mechanics, timekeeping, and other astronomical calculations.
• C. Barycentric Celestial Reference System
  The Barycentric Celestial Reference System is a relativistic, solar-system–centered coordinate framework used in astronomy and astrometry to precisely describe the positions and motions of celestial bodies with respect to the solar system’s center of mass.
• D. IERS Conventions
  IERS Conventions are a set of internationally recognized technical standards and models that define how to precisely measure and reference Earth’s rotation, orientation, and reference frames for geodesy and astronomy.
• E. IAU 2000 resolutions
  The IAU 2000 resolutions are a set of internationally adopted astronomical standards that updated fundamental time scales, reference systems, and models used in celestial mechanics and astrometry.
• F. None of above. chosen
• G. Unsure - the case is ambiguous/there is not enough information to decide.

Generate a one-sentence description of the target entity. 
You are given a context triple in the form (subject, predicate, object), where the object is the target entity. 
# Instructions
Use the triple to infer relevant information about the entity. Describe the entity based on what is most defining, well-known. 
Avoid repeating the information from the triple, unless really essential.
# Response Format
Return only the sentence: "Description: [one-sentence description of the target entity]"

Entity: IAU 1991 resolutions on reference systems
Triple: [IAU 2006 resolutions, relatedTo, IAU 1991 resolutions on reference systems]

The IAU 1991 resolutions on reference systems are a set of standards adopted by the International Astronomical Union that defined modern celestial and terrestrial reference frames and time scales for precise astronomical and geodetic measurements.

Target entity: IAU 1991 resolutions on reference systems
Target entity description: The IAU 1991 resolutions on reference systems are a set of standards adopted by the International Astronomical Union that defined modern celestial and terrestrial reference frames and time scales for precise astronomical and geodetic measurements.

• A. International Celestial Reference System
  The International Celestial Reference System is the standard, high-precision coordinate framework used in astronomy and geodesy to define positions of celestial objects relative to distant quasars.
• B. IAU 1976 system of astronomical constants
  The IAU 1976 system of astronomical constants is a standardized set of numerical values and definitions adopted by the International Astronomical Union to ensure consistency in celestial mechanics, timekeeping, and other astronomical calculations.
• C. Barycentric Celestial Reference System
  The Barycentric Celestial Reference System is a relativistic, solar-system–centered coordinate framework used in astronomy and astrometry to precisely describe the positions and motions of celestial bodies with respect to the solar system’s center of mass.
• D. IERS Conventions
  IERS Conventions are a set of internationally recognized technical standards and models that define how to precisely measure and reference Earth’s rotation, orientation, and reference frames for geodesy and astronomy.
• E. IAU 2000 resolutions chosen
  The IAU 2000 resolutions are a set of internationally adopted astronomical standards that updated fundamental time scales, reference systems, and models used in celestial mechanics and astrometry.
• F. None of above.