祭天的英文：
hold a memorial ceremony for the heaven

参考例句：

Located in southeast Beijing, the Temple of Heaven was built for the emperors in ancient China to worship Heaven.
位于北京城东南的天坛是古代皇帝祭天之处。

hold是什么意思：
n. 控制；握住；保留
v. 拿住，握住；保留；保持不变，持续；约束，控制；拘留；容纳；持有；适用

nail down; nail in;hold by
钉住;使人遵守诺言

We hold on in spite of the storm
我们冒着暴风雨继续前进。

hold a fair to raise money
举办义卖会筹款

memorial是什么意思：
n. 纪念物；纪念碑；纪念馆；纪念活动
adj. 纪念的；追悼的；记忆的

Old people always have long memories and not short memories.
老人家总是有长久不忘的好记性。

People came to the memorial to revere the memory of the great leader.
人们来到纪念馆崇敬地纪念这位伟大的领袖。

The memorial was built in memory of those who died in the war.
这纪念碑乃是为追念战亡的士兵而建立的。

ceremony是什么意思：
n. 典礼；仪式；礼节；客套

MC (master of ceremonies)
司仪|节目主持人

To assemble for a ceremonial military review.
阅兵，检阅为阅兵仪式而集合

This fete of the casting will be a grand ceremony.
这个铸炮节应该好好地庆祝一下。