The question "Is there a long in astrolabe?" is a bit ambiguous. Here's a breakdown to help understand what you might be asking:

1. "Long" as in "length":

* Astrolabes have various parts with different lengths. For example, the alidade, the ruler with sights that rotates around the astrolabe's center, has a specific length.

* The rete, the star map on the astrolabe, also has a specific size and shape.

2. "Long" as in "longitude":

* Astrolabes are primarily used for determining latitude, not longitude. Longitude determination requires more complex techniques and was not reliably achieved until later developments in navigation.

3. "Long" as a specific part name:

* There is no part of an astrolabe specifically called "long."

Clarify your question:

To give you a more specific answer, please clarify what you mean by "long." Do you want to know about:

* The overall length of an astrolabe?

* The length of a specific part?

* How astrolabes relate to longitude?

Once you clarify, I can provide a more helpful response.