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Outline
This paper presents the theoretical relationships between two sets of precession models relative to MERS and GCRS, as well as a complete precession model that accounts for frame bias. The theoretical relationships between different precession angles are derived using vector methods, and two new expressions for the general precession in longitude are provided, one of which is suitable for long-term precession studies. Through numerical calculations, the spherical angle expressions between the north ecliptic pole at the reference and observation epochs and the GCRS polar axis are revised. It is pointed out that the P03 or IAU2006 precession models contain errors on the order of microarcseconds, indicating inconsistencies among different precession angles at the level of several tens of microarcseconds, necessitating a re-examination of the numerical calculations of various precession angles.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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