2 sentences

1. 辛是天干的第八位。

   xīn shì tiān​gān de dì​bā wèi.

   Xin is the eighth of the ten Heavenly Stems.

   Source: Dong Chinese Dictionary

2. 在天干中，己排在戊之后。

   zài tiān​gān zhōng, jǐ pái zài wù zhī​hòu.

   In the Heavenly Stems, 'Ji' follows 'Wu'.

   Source: Dong Chinese Dictionary