From dfeca4c923b83b083385b3478378c6c6e4adc74e Mon Sep 17 00:00:00 2001
From: "Timur A. Fatkhullin" <amirych@gmail.com>
Date: Sun, 2 Mar 2025 01:02:39 +0300
Subject: [PATCH] ...

---
 cxx/mount_astrom.h | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 cxx/mount_astrom.h

diff --git a/cxx/mount_astrom.h b/cxx/mount_astrom.h
new file mode 100644
index 0000000..bf18880
--- /dev/null
+++ b/cxx/mount_astrom.h
@@ -0,0 +1,37 @@
+#pragma once
+
+/*********************************
+ *    MOUNT CONTROL COMPONENTS    *
+ *                                *
+ *      astrometry functions      *
+ *********************************/
+
+#include <chrono>
+#include <concepts>
+#include <xsimd/xsimd.hpp>
+
+
+namespace mcc::traits
+{
+
+template <typename T>
+concept mcc_scalar_or_simd_c = xsimd::is_batch<T>::value || std::is_arithmetic_v<T>;
+
+}  // namespace mcc::traits
+
+
+namespace mcc::astro
+{
+
+// modified Julian date
+template <traits::mcc_scalar_or_simd_c T>
+int mcc_julday(const std::chrono::utc_clock::time_point& greg_time, T& mjd)
+{
+}
+
+template <traits::mcc_scalar_or_simd_c T, typename CT, typename DT>
+T mcc_time_to_alt_limit(const T& alt_limit, const T& RA, const T& DEC, const std::chrono::time_point<CT, DT>& now)
+{
+}
+
+}  // namespace mcc::astro