自转周期

如果Hale-Bopp彗星的自转周期为12h左右，根据27次测定得到喷流的平均速度为（599±34）m/s。

As the rotation period of Comet Hale-Bopp is about 12 hours , the average velocity of jets was determined at ( 599 ± 34 ) m / s according to 27 measurements .

海尔-波普彗星自转周期的测定

Measurement of the Rotation Period of Comet Hale-Bopp

脉冲星在磁偶极辐射作用下自转周期和周期变率随年龄的演变

Evolution of Rotational Period and It 's Rate of Pulsars with Age

从地球上观测，太阳的自转周期约为27天。

Seen from the earth , the sun rotates in about 27 days .

从刚体的转动角谈地球的自转周期

On the period of rotation of the earth

为适应地球物理学的需要，习惯上以27.0日为太阳自转周期。

For geophysical purposes it is customary to use solar rotations of 27 . 0 day .

对脉冲星由于磁辐射使自转周期和周期变率随年龄的演变做了进一步深入研究。

The evolution of rotational period and it 's rate of pulsar with age is studies .

演化恒星的色球活动与恒星自转周期间存在很好的相关性。

The relation between stellar chromospheric activity and rotation of evolution stars have a good relativity .

但是细致分析显示演化恒星色球活动水平随恒星自转周期间的分布对恒星光谱型和恒星表面有效温度有很强的依赖，并对这些现象提出了几种可能的解释。

But meticulous analysis show chromospheric activity of evolution stars depend on stellar spectral type and effective temperature strongly .

天文年历和日历为业余天文学家提供了太阳会合自转周期的始时和经度Lo。

Astronomical yearbooks and calendars for amateur astronomers provide the times of the beginning of the synodic solar rotations as well as the longitudes Lo .

相对实际地球大气而言，在快转条件下，风场季节变率指数显著区在纬圈上呈带状分布，且随自转周期增大，其范围有逐渐减小的趋势；

Horizontally , the DNS is remarkable in the zonal direction at fast rotation rates , and the monsoon areas become smaller and smaller with rotation period increasing .

脉冲星是一种具有超强电磁场、超高密度的高速旋转的中子星，其自转周期极其稳定，长期稳定度甚至优于目前世界上最好的原子钟。

Pulsar is a kind of neutron star with super strong electro-magnetic field and super density . It spins rapidly and extremely stably . Its long-term stability could even be better than the best atomic clock in the world .

从这条曲线，记住这条曲线，，So，from，that，curve&，因为接下来它会，很重要，从中你们推导出3样：，半径，自转周期，已经我旋转的，物体的速度。

And keep that with you , because it 's going to be important in what follows we can derive three things : the radius , the period of rotation and the speed of the object as I twirl it around .

由PREM模型参数计算地球自转的周期变化

Periodic variations of the earth rotation calculated with the Prem parameters

太阳自转的周期大约为27天。

The sun spins around its own axis with a period of about twenty-seven days .

脉冲星具有很强的磁场，进行高速自转，自转周期相当稳定。

Pulsars , which have a great magnetic field , are in a high-speed rotation . The rotation period of the pulsar is relative stability .

地球自转速率的短周期项、大气环流和太阳活动

The Short periodic Terms of Rate of the Earth 's Rotation and the Atmospheric Circulation and the Solar Flare

金星的自转极慢，以致金星的自转周期长达二百四十三个地球日。

Venus rotates very slowly with the result that its cycle of rotation reaches as long as 243 days of the Earth .